Fix bash scripts

chapter1/coprocess.sh

@@ -0,0 +1,64 @@
+#!/usr/bin/env bash
+#
+# SCRIPT: coprocess.sh
+# AUTHOR: Fabio Scotto di Santolo
+# DATE:   29/07/2020
+# REV:    1.1.A 
+#
+# PLATFORM: Not platform dependent
+#
+# PURPOSE: 
+#
+# REV LIST: 
+#
+##########################################################
+#              DEFINE FUNCTIONS HERE
+##########################################################
+ 
+function trap_exit
+{
+    # Tell the co-process to break out of the loop
+    break_out='Y'
+    print -p $break_out # Use "print -p" to talk to the co-process
+}
+
+function proc_watch
+{
+    # This function is started as a co-process
+    while :     # Loop forever
+    do
+        read $break_out     # Do NOT need "-p" to read!
+        if [[ $break_out == 'Y' ]];
+        then
+            return 0
+        fi
+    done
+}
+
+##########################################################
+#               BEGINNING OF MAIN
+##########################################################
+
+trap 'trap_exit; exit 2' 1 2 3 15
+
+total_seconds=300
+break_out='N'
+
+coproc proc_watch   # Start proc_watch as a co-process!!!
+pw_pid=$1           # Process ID of the last background job
+
+until [ total_seconds -eq 0 ];
+do
+    (( total_seconds=total_seconds - 1 ))
+    sleep 1
+done
+
+break_out='Y'
+
+# Use "print -p" to communicate with the co-process variable
+print -p $break_out
+
+kill $pw_pid        # Kill the background co-process
+exit 0
+
+# End of script

chapter1/shifting.sh

@@ -0,0 +1,38 @@
+#!/usr/bin/env bash
+#
+# SCRIPT: shifting.sh
+# AUTHOR: Fabio Scotto di Santolo
+# DATE:   28/07/2020
+# REV:    1.1.A 
+#
+# PLATFORM: Not platform dependent
+#
+# PURPOSE: This script is used to process all of the tokens which
+# are pointed to by the command-line arguments $1, $2, $3, etc...
+#
+# REV LIST:
+#
+##########################################################
+#         DEFINE FILES AND VARIABLES HERE
+##########################################################
+
+total=0 # initialize the total counter to zero 
+
+##########################################################
+#               BEGINNING OF MAIN
+##########################################################
+
+# Start a while loop
+
+for token in $*
+do
+    total=`expr $total + 1`  # A little math in the
+                             # shell script, a running
+                             # total of tokens processed.
+    
+    shift                    # Grab the next token, i.e. $2 become $1
+
+done
+
+echo "Total number of token processed: $total"
+# End of script

chapter2/random_file.bash

@@ -32,7 +32,7 @@ typeset -i MB_SIZE=$1
 typeset -i RN
 typeset -i i=1
 typeset -i X=0
-WORKDIR=/scripts
+WORKDIR=./scripts
 OUTFILE=${WORKDIR}/largefile.random.txt
 >$OUTFILE
 THIS_SCRIPT=$(basename $0)
@@ -42,7 +42,7 @@ CHAR_FILE=${WORKDIR}/char_file.txt
 # DEFINE FUNCTIONS HERE
 ##########################################
 
-build_random_line ()
+function build_random_line
 {
 # This function extracts random characters
 # from the KEYS array by using the RANDOM
@@ -50,7 +50,7 @@ build_random_line ()
 
 C=1
 LINE=
-until (( C > 79 ))
+until [[ C > 79 ]]
 do
    LINE="${LINE}${KEYS[$(($RANDOM % X + 1))]}"
    (( C = C + 1 ))

chapter2/scripts/char_file.txt

@@ -0,0 +1,72 @@
+1
+2
+3
+4
+5
+6
+7
+8
+9
+0
+q
+w
+e
+r
+t
+y
+u
+i
+o
+p
+a
+s
+d
+f
+g
+h
+j
+k
+l
+z
+x
+c
+v
+b
+n
+m
+Q
+W
+E
+R
+T
+Y
+U
+I
+O
+P
+A
+S
+D
+F
+G
+H
+J
+K
+L
+Z
+X
+C
+V
+B
+N
+M
+0
+1
+2
+3
+4
+5
+6
+7
+8
+9