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copied!<p>I think this is precisely what you are asking for:</p> <p><a href="http://www.bashcookbook.com/bashinfo/source/bash-4.0/examples/scripts/timeout3" rel="noreferrer">http://www.bashcookbook.com/bashinfo/source/bash-4.0/examples/scripts/timeout3</a></p> <pre><code>#!/bin/bash # # The Bash shell script executes a command with a time-out. # Upon time-out expiration SIGTERM (15) is sent to the process. If the signal # is blocked, then the subsequent SIGKILL (9) terminates it. # # Based on the Bash documentation example. # Hello Chet, # please find attached a "little easier" :-) to comprehend # time-out example. If you find it suitable, feel free to include # anywhere: the very same logic as in the original examples/scripts, a # little more transparent implementation to my taste. # # Dmitry V Golovashkin <Dmitry.Golovashkin@sas.com> scriptName="${0##*/}" declare -i DEFAULT_TIMEOUT=9 declare -i DEFAULT_INTERVAL=1 declare -i DEFAULT_DELAY=1 # Timeout. declare -i timeout=DEFAULT_TIMEOUT # Interval between checks if the process is still alive. declare -i interval=DEFAULT_INTERVAL # Delay between posting the SIGTERM signal and destroying the process by SIGKILL. declare -i delay=DEFAULT_DELAY function printUsage() { cat <<EOF Synopsis $scriptName [-t timeout] [-i interval] [-d delay] command Execute a command with a time-out. Upon time-out expiration SIGTERM (15) is sent to the process. If SIGTERM signal is blocked, then the subsequent SIGKILL (9) terminates it. -t timeout Number of seconds to wait for command completion. Default value: $DEFAULT_TIMEOUT seconds. -i interval Interval between checks if the process is still alive. Positive integer, default value: $DEFAULT_INTERVAL seconds. -d delay Delay between posting the SIGTERM signal and destroying the process by SIGKILL. Default value: $DEFAULT_DELAY seconds. As of today, Bash does not support floating point arithmetic (sleep does), therefore all delay/time values must be integers. EOF } # Options. while getopts ":t:i:d:" option; do case "$option" in t) timeout=$OPTARG ;; i) interval=$OPTARG ;; d) delay=$OPTARG ;; *) printUsage; exit 1 ;; esac done shift $((OPTIND - 1)) # $# should be at least 1 (the command to execute), however it may be strictly # greater than 1 if the command itself has options. if (($# == 0 || interval <= 0)); then printUsage exit 1 fi # kill -0 pid Exit code indicates if a signal may be sent to $pid process. ( ((t = timeout)) while ((t > 0)); do sleep $interval kill -0 $$ || exit 0 ((t -= interval)) done # Be nice, post SIGTERM first. # The 'exit 0' below will be executed if any preceeding command fails. kill -s SIGTERM $$ && kill -0 $$ || exit 0 sleep $delay kill -s SIGKILL $$ ) 2> /dev/null & exec "$@" </code></pre>

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