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How to check if script is run via cron or manual=command line?

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# 1  
Old 09-01-2012
How to check if script is run via cron or manual=command line?
Hi all,

I have a script that can be run via cron or via the command line.

Is there any way that I can place something on the script to be able to distinguish/differentiate whether the script was run via a user in the command line or whether it was run from the cron?
# 2  
Old 09-01-2012
Check out this link:

https://www.unix.com/shell-programmin...lled-cron.html
# 3  
Old 09-01-2012
Please remember to post what Operating System and version you are running and what Shell you use.

Ignoring the link from @mjf, the simple answer for most Bourne-type Shells is to test whether SDOUT is a terminal or not:

Code:
if [ -t 1 ]
then
        echo "From cron"
else
        echo "Not from cron"
fi

# 4  
Old 09-02-2012
@methyl: You've typed it the other way around:
Code:
if [ -t 1 ] ; then 
   echo "Not from cron"  #since FD 1 (stdout) is open
else
   echo "From cron"   
fi

Note that this may not be reliable for all cases. E.g. In your script you redirect all output to a file; then stdout is not open, and [ -t 1 ] will evaluate to false.

I personally like Perderabo's solution from the link above best.
Last edited by mirni; 09-02-2012 at 02:35 AM..
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