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chapter15/hgrep.ksh

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+#!/usr/bin/ksh
+#
+# SCRIPT: hgrep.ksh
+# AUTHOR: Randy Michael
+# DATE: 03/09/2001
+# REV 2.1.P
+# 
+# PLATFORM: Not Platform Dependent
+#
+# PURPOSE: This script is used to highlight text in a file.  Given a text
+#	string and a file the script will search the file for the specified
+#	string and highlight each occurrence of the string by paging
+#	a temporary file which has the string text highlighted.
+#
+# REV LIST:
+#
+# set -x        # Uncomment to debug
+# set -n        # Uncomment to check command syntax without execution
+#
+# EXIT CODES:
+#
+#       0 ==> Script exited normally
+#       1 ==> Usage error
+#       2 ==> Input File Error
+#	3 ==> Pattern not found in the file
+#
+# REV LIST:
+#		03/12/2001 - Randy Michael - Sr. Sys. Admin.
+#		Added code to just exit if the string is not in
+#		the target file.
+#
+#		03/13/2001 - Randy Michael - Sr. Sys. Admin.
+#		Added code to ensure the target file is a readable "regular"
+#		non-zero file.
+#
+#		03/13/2001 - Randy Michael - Sr. Sys. Admin.
+#		Added code to highlight the text string and filename 
+#		in the error and information messages.
+#
+#               08-22-2001 - Randy Michael - Sr. Sys. Admin
+#               Changed the code to allow this script to accept standard
+#               input from a pipe.  This makes the script work more like the
+#               grep command
+
+SCRIPT_NAME=`basename $0`
+
+##############################################
+########### DEFINE FUNCTIONS HERE ############
+##############################################
+
+function usage
+{
+        echo "\nUSAGE: $SCRIPT_NAME  pattern  [filename]\n"
+}
+
+##############################################
+########### CHECK COMMAND SYNTAX #############
+##############################################
+
+
+# Input coming from standard input
+
+if [ $# -eq 1 ] 
+then
+     # Input coming from standard input
+
+     PATTERN="$1" # Pattern to highlight
+     FILENAME=    # Assign NULL to FILENAME
+
+elif [ $# -eq 2 ]
+then
+     # Input coming from $FILENAME file
+
+     PATTERN="$1"  # Pattern to highlight
+     FILENAME="$2" # File to use as input
+
+     # Does the file exist as a "regular" file?
+
+     if [ ! -f $FILENAME ]
+     then
+        echo "\nERROR: $FILENAME does not exist...\n"
+        usage
+        exit 2
+     fi
+
+     # Is the file empty?
+
+     if [ ! -s $FILENAME ]
+     then
+        echo "\nERROR: \c"
+        tput smso
+        echo "$FILENAME\c"
+        tput sgr0
+        echo " file size is zero...nothing to search\n"
+        usage
+        exit 2
+     fi
+
+     # Is the file readable by this script?
+
+     if [ ! -r $FILENAME ]
+     then
+        echo "\nERROR: \c"
+        tput smso
+        echo "${FILENAME}\c"
+        tput sgr0
+        echo " is not readable to this program...\n"
+        usage
+        exit 2
+     fi
+
+     # Is the pattern anywhere in the file?
+
+     grep "$PATTERN" $FILENAME >/dev/null 2>&1
+     if [ $? -ne 0 ]
+     then
+        echo "\nSORRY: The string \c"
+        tput smso
+        echo "${PATTERN}\c"
+        tput sgr0
+        echo " was not found in \c"
+        tput smso
+        echo "${FILENAME}\c"
+        tput sgr0
+        echo "\n\n....EXITING...\n"
+        exit 3
+     fi
+else
+     # Incorrect number of command line arguments
+
+     usage
+     exit 1
+fi
+
+##############################################
+########### DEFINE VARIABLES HERE ############
+##############################################
+
+OUTPUT_FILE="/tmp/highlightfile.out"
+>$OUTPUT_FILE
+
+##############################################
+############ START OF MAIN ###################
+##############################################
+
+# There is no $FILENAME if we get input from a pipe...
+
+if [[ ! -z "$FILENAME" && $FILENAME != '' ]]
+then
+     # Using $FILENAME as input
+
+     cat "$FILENAME" \
+     | sed s/"${PATTERN}"/$(tput smso)"${PATTERN}"$(tput sgr0)/g \
+       > $OUTPUT_FILE
+else
+     # Input is from standard input...
+
+     sed s/"${PATTERN}"/$(tput smso)"${PATTERN}"$(tput sgr0)/g \
+         > $OUTPUT_FILE
+
+     # Is the pattern anywhere in the file?
+
+     grep "$PATTERN" $OUTPUT_FILE >/dev/null 2>&1
+     if [ $? -ne 0 ]
+     then
+        echo "\nSORRY: The string \c"
+        tput smso
+        echo "${PATTERN}\c"
+        tput sgr0
+        echo " was not found in standard input\c"
+        echo "\n\n....EXITING...\n"
+        exit 3
+     fi
+
+fi
+
+# Check the operating system, on AIX and HP-UX we need to
+# use the "pg", or "page" command.  The "more" command does
+# not work to highlight the text, it will only show the
+# characters that make up the escape sequence.  All
+# other operating system usr the "more" command.
+
+case $(uname) in
+AIX|HP-UX)
+
+     # This is a fancy "pg" command.  It acts similar to the
+     # "more" command but instead of showing the percentage
+     # displayed it shows the page number of the file
+
+     cat $OUTPUT_FILE | pg -csn -p"Page %d:"
+   ;;
+*)
+     cat $OUTPUT_FILE | more
+   ;;
+esac