Restrain running the same script at the same time?

[Guest_imported]

Hi!
Does anyone know how to prevent a script from running again simultaneous with another (This refers to only 1 script program).
Thanks!
Hono'o

 

[ilTinus]

Use a semaphore/flag like a temporary file or look for the process already running,
'ps -ef' or 'ps -ax'.

Yours Mauro

 

[gregor weertman]

Make sure that your "ps -ef |grep etc..." is unique.
It can happen that you are checking for blabla and someone is Editing blabla.txt.
Your script will not start.
Check for example “grep sh.*blabla” instead.
When you use a lock file make sure the file is deleted when the script exits normally or when it is killed.
Use the trap command to remove the lock file.
Gregor.Weertman@mailcity.com

 

[SpiritOfLennon]

Alternatively, issue a chmod command at the start of the script to remove the execute permissions and then restore them at the end of the script