bash - Shell Script to run command every 5secs for x number of secs -


i'm learning bash scripting , want call function every 5 seconds x number of seconds. x determined command line argument when script run. i've tried watch seems go on forever, don't seem have ability return after x seconds. there might sleep way seems clumsy , have deal local drift. there elegant solution?

my code:

#!/bin/bash  if [ $# -ne 1 ]; # 1 command line arg allowed    echo "incorrect arguments"    exit 1 elif ! [[ $1 =~ ^[0-9]+$ ]]; # arg must digit    echo "argument must positive number"    exit 1 fi  ask() {     output=$(snmpwalk -v2c -c community server oib)     cleanoutput="${output:32}%"     echo $cleanoutput }  #export -f ask #watch -n5 ask

the seconds variable counts number of seconds since bash started:

#!/bin/bash  while (( seconds <= 20 ))   echo "running something"   sleep 5 || break done echo "done"

this simplistic method sleep 5 after last run when know it'll go on 20 seconds, , not try account run time of command (if command runs 2 seconds, it'll end starting once every 7 seconds).


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