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How to determine if a script (perl) was called from a CRON job or commandline

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# 1  
Old 03-22-2006
How to determine if a script (perl) was called from a CRON job or commandline
Hi,

Is there a way to determine if a Script is called from a
CRON job or from a commandline

Gerry.
# 2  
Old 03-22-2006
Report from cron vs. command line
cron is pretty good about reporting to the user its status, i.e. whether it's running / active. If you're suspicious, then I would suggest placing an echo
statement (1.) in the/(a) cron script and noting its affect. I suggest you have a look at the man page for cron as well.

1. echo "This output has been created by cron..."

Good luck!
Smilie
# 3  
Old 03-23-2006
If your UNIX maintains a PPID variable in the environment then this will point to cron:

# echo $PPID
86838
# ps -fp 23266
UID PID PPID C STIME TTY TIME CMD
root 23266 1 0 03 Jan - 1:37 /usr/sbin/cron

If not then (a lot looser), you could look at the TERM variable. THis is usually 'dumb' for cron whereas users will have a real terminal type; like vt220, wy50 etc.

cheers
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