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chapter10/proc_mon.ksh

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+#!/usr/bin/ksh
+#
+# SCRIPT: proc_mon.ksh
+# AUTHOR: Randy Michael
+# DATE: 02/14/2007
+# REV: 1.1.P
+# PLATFORM: Not Platform Dependent
+#
+# PURPOSE: This script is used to monitor a process to end
+#   specified by ARG1 if a single command-line argument is
+#   used. There is also a "verbose" mode where the monitored
+#   process is displayed and ARG2 is monitored.
+#
+# USAGE: proc_mon.ksh [-v] process-to-monitor
+#
+# EXIT STATUS:
+#    0 ==> Monitored process has terminated
+#    1 ==> Script usage error
+#    2 ==> Target process to monitor is not active
+#    3 ==> This script exits on a trapped signal
+#
+# REV. LIST:
+#
+#    02/22/2007 - Added code for a "verbose" mode to output the
+#                 results of the .ps aux. command. The verbose
+#                 mode is set using a "-v" switch.
+#
+# set -x # Uncomment to debug this script
+# set -n # Uncomment to debug without any command execution
+
+SCRIPT_NAME=`basename $0`
+
+########################################################
+############ DEFINE FUNCTIONS HERE #####################
+########################################################
+
+function usage
+{
+    echo "\n\n"
+    echo "USAGE: $SCRIPT_NAME [-v] {Process_to_monitor}"
+    echo "\nEXAMPLE: $SCRIPT_NAME my_backup\n"
+    echo "OR"
+    echo "\nEXAMPLE: $SCRIPT_NAME -v my_backup\n"
+    echo "Try again...EXITING...\n"
+}
+########################################################
+
+function exit_trap
+{
+    echo "\n...EXITING on trapped signal...\n"
+}
+########################################################
+################ START OF MAIN##########################
+########################################################
+
+################
+# Set a trap...#
+################
+
+trap 'exit_trap; exit 3' 1 2 3 15
+
+# First Check for the Correct Number of Arguments
+# One or Two is acceptable
+
+if (( $# != 1 && $# != 2 ))
+then
+    usage
+    exit 1
+fi
+
+# Parse through the command-line arguments and see if verbose
+# mode has been specified. NOTICE that we assign the target
+# process to the PROCESS variable!!!
+# Embedded case statement...
+
+case $# in
+      1) case $1 in
+         '-v') usage
+               exit 1
+               ;;
+            *) PROCESS=$1
+               ;;
+         esac
+         ;;
+      2) case $1 in
+         '-v') continue
+               ;;
+         esac
+
+         case $2 in
+         '-v') usage
+               exit 1
+               ;;
+            *) PROCESS=$2
+               ;;
+         esac
+         ;;
+      *) usage
+         exit 1
+         ;;
+esac
+
+# Check if the process is running or exit!
+
+ps aux | grep "$PROCESS" | grep -v "grep $PROCESS" \
+| grep -v $SCRIPT_NAME >/dev/null
+
+if (( $? != 0 ))
+then
+    echo "\n\n$PROCESS is NOT an active process...EXITING...\n"
+    exit 2
+fi
+
+# Show verbose mode if specified...
+
+if (( $# == 2 )) && [[ $1 = "-v" ]]
+then
+    # Verbose mode has been specified!
+    echo "\n"
+
+    # Extract the columns heading from the ps aux output
+    ps aux | head -n 1
+
+    ps aux | grep "$PROCESS" | grep -v "grep $PROCESS" \
+           | grep -v $SCRIPT_NAME
+fi
+
+##### O.K. The process is running, start monitoring...
+
+SLEEP_TIME="1" # Seconds between monitoring
+
+RC="0" # RC is the Return Code
+echo "\n\n" # Give a couple of blank lines
+
+echo "$PROCESS is currently RUNNING...`date`\n"
+
+####################################
+# Loop UNTIL the $PROCESS stops...
+
+while (( RC == 0 )) # Loop until the return code is not zero
+do
+     ps aux | grep $PROCESS | grep -v "grep $PROCESS" \
+            | grep -v $SCRIPT_NAME >/dev/null 2>&1
+     if (( $? != 0 )) # Check the Return Code!!!!!
+     then
+         echo "\n...$PROCESS has COMPLETED...`date`\n"
+         exit 0
+     fi
+     sleep $SLEEP_TIME # Needed to reduce CPU Load!!!
+done
+
+# End of Script