linux - Schedule cron entries to run script only when not already running -


i have 1 shell script in crontab executing jar file. jar file moving files 1 server server. in peak hours taking more 10 minutes(more crontab entries).

how can make sure cron job not execute process until last 1 not completed ?

an easy way have cron start bashfile checks if such process exist.

cron: 

 */10 * * * * /path/to/bashscript.sh

(make sure has correct user , executable)

the pgrep command looks process given name, , returns processid when such process found. 

#!/bin/bash # bashscript.sh      pid=$(pgrep -n "yourjarfile")   # check if jarfile running if $pid > /dev/null            #log syslog      logger  $pid "already running. not restarting."  else     # start jar file      /usr/bin/java -jar /path/to/yourjarfile.jar fi

--edit--

inspired f. hauri's answer (which works fine btw), came shorter version :

 */10 * * * *  pgrep -n "yourjarfile." || /usr/bin/java -jar /path/to/yourjarfile.jar

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