linux - Multiple crontabs needed -

so have looked solution everywhere , never got answer.

how make multiple crontabs? running scripts interfere , 110% sure if able run multiple crontabs solve issue. (yeah tried everything). can perhaps make multiple users each have own crontab? , crontabs run @ same time?

thanks!

there's no exclusivity inherent in multiple crontabs. if 2 separate crontabs each run script every monday @ 4am, cron run both scripts more or less @ same time, on mondays @ 4am.

at guess, need locking, 1 or other of interfering scripts runs @ time. flock(1) convenient tool use in shell scripts.

#!/bin/bash  exec 3> /path/to/lock flock 3  # useful here  exit 0  # releases lock 

the above acquires advisory lock, or waits until lock freed , acquires it. try once without waiting, can following:

#!/bin/bash  exec 3> /path/to/lock flock -n 3 || exit 1