initial commit
This commit is contained in:
824
chapter2/24_ways_to_parse.ksh
Executable file
824
chapter2/24_ways_to_parse.ksh
Executable file
@@ -0,0 +1,824 @@
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#!/usr/bin/ksh
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#
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# SCRIPT: 24_ways_to_parse.ksh
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# AUTHOR: Randy Michael
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# DATE: 08/15/2007
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# REV: 2.5.Q
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#
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# PURPOSE: This script shows the different ways of reading
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# a file line-by-line. Again there is not just one way
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# to read a file line-by-line and some are faster than
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# others and some are more intuitive than others.
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#
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# REV LIST:
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#
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# 03/15/2007 - Randy Michael
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# Set each of the while loops up as functions and the timing
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# of each function to see which one is the fastest.
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#
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###############
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#
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# 08/10/2007 - Randy Michael
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# Modified this script to include a total of 24 functions
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# to parse a file line-by-line.
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#
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#######################################################################
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#
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# NOTE: To output the timing to a file use the following syntax:
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#
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# 24_ways_to_parse.ksh file_to_process > output_file_name 2>&1
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#
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# The actual timing data is sent to standard error, file
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# descriptor (2), and the function name header is sent
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# to standard output, file descriptor (1).
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#
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#######################################################################
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#
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# set -n # Uncomment to check command syntax without any execution
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# set -x # Uncomment to debug this script
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#
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INFILE="$1"
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OUTFILE=writefile.out
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TIMEFILE="/tmp/loopfile.out"
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>$TIMEFILE
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THIS_SCRIPT=$(basename $0)
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######################################
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function usage
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{
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echo "\nUSAGE: $THIS_SCRIPT file_to_process\n"
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echo "OR - To send the output to a file use: "
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echo "\n$THIS_SCRIPT file_to_process > output_file_name 2>&1 \n"
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exit 1
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}
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######################################
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function verify_files
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{
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diff $INFILE $OUTFILE >/dev/null 2>&1
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if (( $? != 0 ))
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then
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echo "ERROR: $INFILE and $OUTFILE do not match"
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ls -l $INFILE $OUTFILE
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fi
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}
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######################################
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function cat_while_read_LINE
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{
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# Method 1
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# Zero out the $OUTFILE
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>$OUTFILE
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cat $INFILE | while read LINE
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do
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echo "$LINE" >> $OUTFILE
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:
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done
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}
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######################################
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function while_read_LINE_bottom
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{
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# Method 2
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# Zero out the $OUTFILE
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>$OUTFILE
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while read LINE
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do
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echo "$LINE" >> $OUTFILE
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:
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done < $INFILE
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}
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######################################
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function cat_while_LINE_line
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{
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# Method 3
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# Zero out the $OUTFILE
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>$OUTFILE
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cat $INFILE | while LINE=`line`
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do
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echo "$LINE" >> $OUTFILE
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:
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done
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}
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######################################
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function while_LINE_line_bottom
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{
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# Method 4
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# Zero out the $OUTFILE
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>$OUTFILE
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while LINE=`line`
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do
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echo "$LINE" >> $OUTFILE
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:
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done < $INFILE
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}
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######################################
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function cat_while_LINE_line_cmdsub2
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{
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# Method 5
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# Zero out the $OUTFILE
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>$OUTFILE
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cat $INFILE | while LINE=$(line)
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do
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echo "$LINE" >> $OUTFILE
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:
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done
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}
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######################################
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function while_LINE_line_bottom_cmdsub2
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{
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# Method 6
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# Zero out the $OUTFILE
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>$OUTFILE
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while LINE=$(line)
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do
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echo "$LINE" >> $OUTFILE
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:
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done < $INFILE
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}
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######################################
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for_LINE_cat_FILE ()
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{
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# Method 7
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# Zero out the $OUTFILE
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>$OUTFILE
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for LINE in `cat $INFILE`
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do
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echo "$LINE" >> $OUTFILE
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:
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done
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}
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######################################
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for_LINE_cat_FILE_cmdsub2 ()
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{
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# Method 8
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# Zero out the $OUTFILE
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>$OUTFILE
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for LINE in $(cat $INFILE)
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do
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echo "$LINE" >> $OUTFILE
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:
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done
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}
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#####################################
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while_line_outfile ()
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{
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# Method 9
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# Zero out the $OUTFILE
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>$OUTFILE
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# This function processes every other
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# line of the $INFILE, so do not use
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# this method
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while read
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do
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line >>$OUTFILE
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:
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done < $INFILE
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}
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#####################################
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function while_read_LINE_FD_IN
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{
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# Method 10
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# Zero out the $OUTFILE
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>$OUTFILE
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# Associate standard input with file descriptor 3
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# and redirect standard input to $INFILE
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exec 3<&0
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exec 0< $INFILE
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while read LINE
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do
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echo "$LINE" >> $OUTFILE
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:
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done
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# Restore standard input and close file
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# descriptor 3
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exec 0<&3
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exec 3>&-
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}
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######################################
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function cat_while_read_LINE_FD_OUT
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{
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# Method 11
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# Zero out the $OUTFILE
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>$OUTFILE
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# Associate standard output with file descriptor 4
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# and redirect standard output to $OUTFILE
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exec 4<&1
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exec 1> $OUTFILE
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cat $INFILE | while read LINE
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do
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echo "$LINE"
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:
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done
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# Restore standard output and close file
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# descriptor 4
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exec 1<&4
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exec 4>&-
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}
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######################################
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function while_read_LINE_bottom_FD_OUT
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{
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# Method 12
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# Zero out the $OUTFILE
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>$OUTFILE
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# Associate standard output with file descriptor 4
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# and redirect standard output to $OUTFILE
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exec 4<&1
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exec 1> $OUTFILE
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|
||||
while read LINE
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do
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echo "$LINE"
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:
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done < $INFILE
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# Restore standard output and close file
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# descriptor 4
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exec 1<&4
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exec 4>&-
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}
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######################################
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function while_LINE_line_bottom_FD_OUT
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{
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# Method 13
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# Zero out the $OUTFILE
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>$OUTFILE
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# Associate standard output with file descriptor 4
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# and redirect standard output to $OUTFILE
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exec 4<&1
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exec 1> $OUTFILE
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while LINE=`line`
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do
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echo "$LINE"
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:
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done < $INFILE
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||||
# Restore standard output and close file
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# descriptor 4
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exec 1<&4
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exec 4>&-
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}
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######################################
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function while_LINE_line_bottom_cmdsub2_FD_OUT
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{
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# Method 14
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# Zero out the $OUTFILE
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||||
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>$OUTFILE
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# Associate standard output with file descriptor 4
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# and redirect standard output to $OUTFILE
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exec 4<&1
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exec 1> $OUTFILE
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while LINE=$(line)
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do
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echo "$LINE"
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:
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done < $INFILE
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# Restore standard output and close file
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# descriptor 4
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exec 1<&4
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exec 4>&-
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}
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######################################
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for_LINE_cat_FILE_FD_OUT ()
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{
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# Method 15
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# Zero out the $OUTFILE
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||||
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>$OUTFILE
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||||
|
||||
# Associate standard output with file descriptor 4
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||||
# and redirect standard output to $OUTFILE
|
||||
|
||||
exec 4<&1
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exec 1> $OUTFILE
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||||
|
||||
for LINE in `cat $INFILE`
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||||
do
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||||
echo "$LINE"
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||||
:
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||||
done
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||||
|
||||
# Restore standard output and close file
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||||
# descriptor 4
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||||
|
||||
exec 1<&4
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exec 4>&-
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||||
}
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||||
######################################
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||||
|
||||
for_LINE_cat_FILE_cmdsub2_FD_OUT ()
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{
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# Method 16
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||||
|
||||
# Zero out the $OUTFILE
|
||||
|
||||
>$OUTFILE
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||||
|
||||
# Associate standard output with file descriptor 4
|
||||
# and redirect standard output to $OUTFILE
|
||||
|
||||
exec 4<&1
|
||||
exec 1> $OUTFILE
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||||
|
||||
for LINE in $(cat $INFILE)
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||||
do
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||||
echo "$LINE"
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||||
:
|
||||
done
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||||
|
||||
# Restore standard output and close file
|
||||
# descriptor 4
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||||
|
||||
exec 1<&4
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||||
exec 4>&-
|
||||
}
|
||||
#####################################
|
||||
|
||||
while_line_outfile_FD_IN ()
|
||||
{
|
||||
# Method 17
|
||||
|
||||
# Zero out the $OUTFILE
|
||||
|
||||
>$OUTFILE
|
||||
|
||||
# Associate standard input with file descriptor 3
|
||||
# and redirect standard input to $INFILE
|
||||
|
||||
exec 3<&0
|
||||
exec 0< $INFILE
|
||||
|
||||
# This function processes every other
|
||||
# line of the $INFILE, so do not use
|
||||
# this method
|
||||
|
||||
while read
|
||||
do
|
||||
line >> $OUTFILE
|
||||
:
|
||||
done
|
||||
|
||||
# Restore standard input and close file
|
||||
# descriptor 3
|
||||
|
||||
exec 0<&3
|
||||
exec 3>&-
|
||||
}
|
||||
#####################################
|
||||
|
||||
while_line_outfile_FD_OUT ()
|
||||
{
|
||||
# Method 18
|
||||
|
||||
# Zero out the $OUTFILE
|
||||
|
||||
>$OUTFILE
|
||||
|
||||
# Associate standard output with file descriptor 4
|
||||
# and redirect standard output to $OUTFILE
|
||||
|
||||
exec 4<&1
|
||||
exec 1> $OUTFILE
|
||||
|
||||
# This function processes every other
|
||||
# line of the $INFILE, so do not use
|
||||
# this method
|
||||
|
||||
while read
|
||||
do
|
||||
line
|
||||
:
|
||||
done < $INFILE
|
||||
|
||||
# Restore standard output and close file
|
||||
# descriptor 4
|
||||
|
||||
exec 1<&4
|
||||
exec 4>&-
|
||||
}
|
||||
#####################################
|
||||
|
||||
while_line_outfile_FD_IN_AND_OUT ()
|
||||
{
|
||||
# Method 19
|
||||
|
||||
# Zero out the $OUTFILE
|
||||
|
||||
>$OUTFILE
|
||||
|
||||
# Associate standard input with file descriptor 3
|
||||
# and redirect standard input to $INFILE
|
||||
|
||||
exec 3<&0
|
||||
exec 0< $INFILE
|
||||
|
||||
# Associate standard output with file descriptor 4
|
||||
# and redirect standard output to $OUTFILE
|
||||
|
||||
exec 4<&1
|
||||
exec 1> $OUTFILE
|
||||
|
||||
while read
|
||||
do
|
||||
line
|
||||
:
|
||||
done
|
||||
|
||||
# Restore standard output and close file
|
||||
# descriptor 4
|
||||
|
||||
exec 1<&4
|
||||
exec 4>&-
|
||||
|
||||
# Restore standard input and close file
|
||||
# descriptor 3
|
||||
|
||||
exec 0<&3
|
||||
exec 3>&-
|
||||
}
|
||||
#####################################
|
||||
|
||||
function while_LINE_line_FD_IN
|
||||
{
|
||||
# Method 20
|
||||
|
||||
# Zero out the $OUTFILE
|
||||
|
||||
>$OUTFILE
|
||||
|
||||
# Associate standard input with file descriptor 3
|
||||
# and redirect standard input to $INFILE
|
||||
|
||||
exec 3<&0
|
||||
exec 0< $INFILE
|
||||
|
||||
while LINE=`line`
|
||||
do
|
||||
echo "$LINE" >> $OUTFILE
|
||||
:
|
||||
done
|
||||
|
||||
# Restore standard input and close file
|
||||
# descriptor 3
|
||||
|
||||
exec 0<&3
|
||||
exec 3>&-
|
||||
}
|
||||
######################################
|
||||
|
||||
function while_LINE_line_cmdsub2_FD_IN
|
||||
{
|
||||
# Method 21
|
||||
|
||||
# Zero out the $OUTFILE
|
||||
|
||||
>$OUTFILE
|
||||
|
||||
# Associate standard input with file descriptor 3
|
||||
# and redirect standard input to $INFILE
|
||||
|
||||
exec 3<&0
|
||||
exec 0< $INFILE
|
||||
|
||||
while LINE=$(line)
|
||||
do
|
||||
echo "$LINE" >> $OUTFILE
|
||||
:
|
||||
done
|
||||
|
||||
# Restore standard input and close file
|
||||
# descriptor 3
|
||||
|
||||
exec 0<&3
|
||||
exec 3>&-
|
||||
}
|
||||
######################################
|
||||
|
||||
function while_read_LINE_FD_IN_AND_OUT
|
||||
{
|
||||
# Method 22
|
||||
|
||||
# Zero out the $OUTFILE
|
||||
|
||||
>$OUTFILE
|
||||
|
||||
# Associate standard input with file descriptor 3
|
||||
# and redirect standard input to $INFILE
|
||||
|
||||
exec 3<&0
|
||||
exec 0< $INFILE
|
||||
|
||||
# Associate standard output with file descriptor 4
|
||||
# and redirect standard output to $OUTFILE
|
||||
|
||||
exec 4<&1
|
||||
exec 1> $OUTFILE
|
||||
|
||||
while read LINE
|
||||
do
|
||||
echo "$LINE"
|
||||
:
|
||||
done
|
||||
|
||||
# Restore standard output and close file
|
||||
# descriptor 4
|
||||
|
||||
exec 1<&4
|
||||
exec 4>&-
|
||||
|
||||
# Restore standard input and close file
|
||||
# descriptor 3
|
||||
|
||||
exec 0<&3
|
||||
exec 3>&-
|
||||
}
|
||||
######################################
|
||||
|
||||
function while_LINE_line_FD_IN_AND_OUT
|
||||
{
|
||||
# Method 23
|
||||
|
||||
# Zero out the $OUTFILE
|
||||
|
||||
>$OUTFILE
|
||||
|
||||
# Associate standard input with file descriptor 3
|
||||
# and redirect standard input to $INFILE
|
||||
|
||||
exec 3<&0
|
||||
exec 0< $INFILE
|
||||
|
||||
# Associate standard output with file descriptor 4
|
||||
# and redirect standard output to $OUTFILE
|
||||
|
||||
exec 4<&1
|
||||
exec 1> $OUTFILE
|
||||
|
||||
while LINE=`line`
|
||||
do
|
||||
echo "$LINE"
|
||||
:
|
||||
done
|
||||
|
||||
# Restore standard output and close file
|
||||
# descriptor 4
|
||||
|
||||
exec 1<&4
|
||||
exec 4>&-
|
||||
|
||||
# Restore standard input and close file
|
||||
# descriptor 3
|
||||
|
||||
exec 0<&3
|
||||
exec 3>&-
|
||||
}
|
||||
######################################
|
||||
|
||||
function while_LINE_line_cmdsub2_FD_IN_AND_OUT
|
||||
{
|
||||
# Method 24
|
||||
|
||||
# Zero out the $OUTFILE
|
||||
|
||||
>$OUTFILE
|
||||
|
||||
# Associate standard input with file descriptor 3
|
||||
# and redirect standard input to $INFILE
|
||||
|
||||
exec 3<&0
|
||||
exec 0< $INFILE
|
||||
|
||||
# Associate standard output with file descriptor 4
|
||||
# and redirect standard output to $OUTFILE
|
||||
|
||||
exec 4<&1
|
||||
exec 1> $OUTFILE
|
||||
|
||||
while LINE=$(line)
|
||||
do
|
||||
echo "$LINE"
|
||||
:
|
||||
done
|
||||
|
||||
# Restore standard output and close file
|
||||
# descriptor 4
|
||||
|
||||
exec 1<&4
|
||||
exec 4>&-
|
||||
|
||||
# Restore standard input and close file
|
||||
# descriptor 3
|
||||
|
||||
exec 0<&3
|
||||
exec 3>&-
|
||||
}
|
||||
|
||||
######################################
|
||||
########### START OF MAIN ############
|
||||
######################################
|
||||
|
||||
# Test the Input
|
||||
|
||||
# Looking for exactly one parameter
|
||||
(( $# == 1 )) || usage
|
||||
|
||||
# Does the file exist as a regular file?
|
||||
[[ -f $1 ]] || usage
|
||||
|
||||
echo "\nStarting File Processing of each Method\n"
|
||||
|
||||
echo "Method 1:"
|
||||
echo "function cat_while_read_LINE"
|
||||
time cat_while_read_LINE
|
||||
verify_files
|
||||
sleep 1
|
||||
echo "\nMethod 2:"
|
||||
echo "function while_read_LINE_bottom"
|
||||
time while_read_LINE_bottom
|
||||
verify_files
|
||||
sleep 1
|
||||
echo "\nMethod 3:"
|
||||
echo "function cat_while_LINE_line"
|
||||
time cat_while_LINE_line
|
||||
verify_files
|
||||
sleep 1
|
||||
echo "\nMethod 4:"
|
||||
echo "function while_LINE_line_bottom"
|
||||
time while_LINE_line_bottom
|
||||
verify_files
|
||||
sleep 1
|
||||
echo "\nMethod 5:"
|
||||
echo "function cat_while_LINE_line_cmdsub2"
|
||||
time cat_while_LINE_line_cmdsub2
|
||||
verify_files
|
||||
sleep 1
|
||||
echo "\nMethod 6:"
|
||||
echo "function while_LINE_line_botton_cmdsub2"
|
||||
time while_LINE_line_bottom_cmdsub2
|
||||
verify_files
|
||||
sleep 1
|
||||
echo "\nMethod 7:"
|
||||
echo "function for_LINE_cat_FILE"
|
||||
time for_LINE_cat_FILE
|
||||
verify_files
|
||||
sleep 1
|
||||
echo "\nMethod 8:"
|
||||
echo "function for_LINE_cat_FILE_cmdsub2"
|
||||
time for_LINE_cat_FILE_cmdsub2
|
||||
verify_files
|
||||
sleep 1
|
||||
echo "\nMethod 9:"
|
||||
echo "function while_line_outfile"
|
||||
time while_line_outfile
|
||||
verify_files
|
||||
sleep 1
|
||||
echo "\nMethod 10:"
|
||||
echo "function while_read_LINE_FD_IN"
|
||||
time while_read_LINE_FD_IN
|
||||
verify_files
|
||||
sleep 1
|
||||
echo "\nMethod 11:"
|
||||
echo "function cat_while_read_LINE_FD_OUT"
|
||||
time cat_while_read_LINE_FD_OUT
|
||||
verify_files
|
||||
sleep 1
|
||||
echo "\nMethod 12:"
|
||||
echo "function while_read_LINE_bottom_FD_OUT"
|
||||
time while_read_LINE_bottom_FD_OUT
|
||||
verify_files
|
||||
sleep 1
|
||||
echo "\nMethod 13:"
|
||||
echo "function while_LINE_line_bottom_FD_OUT"
|
||||
time while_LINE_line_bottom_FD_OUT
|
||||
verify_files
|
||||
sleep 1
|
||||
echo "\nMethod 14:"
|
||||
echo "function while_LINE_line_bottom_cmdsub2_FD_OUT"
|
||||
time while_LINE_line_bottom_cmdsub2_FD_OUT
|
||||
verify_files
|
||||
sleep 1
|
||||
echo "\nMethod 15:"
|
||||
echo "function for_LINE_cat_FILE_FD_OUT"
|
||||
time for_LINE_cat_FILE_FD_OUT
|
||||
verify_files
|
||||
sleep 1
|
||||
echo "\nMethod 16:"
|
||||
echo "function for_LINE_cat_FILE_cmdsub2_FD_OUT"
|
||||
time for_LINE_cat_FILE_cmdsub2_FD_OUT
|
||||
verify_files
|
||||
sleep 1
|
||||
echo "\nMethod 17:"
|
||||
echo "function while_line_outfile_FD_IN"
|
||||
time while_line_outfile_FD_IN
|
||||
verify_files
|
||||
sleep 1
|
||||
echo "\nMethod 18:"
|
||||
echo "function while_line_outfile_FD_OUT"
|
||||
time while_line_outfile_FD_OUT
|
||||
verify_files
|
||||
sleep 1
|
||||
echo "\nMethod 19:"
|
||||
echo "function while_line_outfile_FD_IN_AND_OUT"
|
||||
time while_line_outfile_FD_IN_AND_OUT
|
||||
verify_files
|
||||
sleep 1
|
||||
echo "\nMethod 20:"
|
||||
echo "function while_LINE_line_FD_IN"
|
||||
time while_LINE_line_FD_IN
|
||||
verify_files
|
||||
sleep 1
|
||||
echo "\nMethod 21:"
|
||||
echo "function while_LINE_line_cmdsub2_FD_IN"
|
||||
time while_LINE_line_cmdsub2_FD_IN
|
||||
verify_files
|
||||
sleep 1
|
||||
echo "\nMethod 22:"
|
||||
echo "function while_read_LINE_FD_IN_AND_OUT"
|
||||
time while_read_LINE_FD_IN_AND_OUT
|
||||
verify_files
|
||||
sleep 1
|
||||
echo "\nMethod 23:"
|
||||
echo "function while_LINE_line_FD_IN_AND_OUT"
|
||||
time while_LINE_line_FD_IN_AND_OUT
|
||||
verify_files
|
||||
sleep 1
|
||||
echo "\nMethod 24:"
|
||||
echo "function while_LINE_line_cmdsub2_FD_IN_AND_OUT"
|
||||
time while_LINE_line_cmdsub2_FD_IN_AND_OUT
|
||||
verify_files
|
||||
|
||||
Reference in New Issue
Block a user