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Old 04-01-2016, 09:36 AM   #1
mikenash
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Registered: Dec 2014
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What does the || true do in the mesg command do?


mesg n || true
Found this mseg command in a .profile that causes an error when logging into the user on lightvm. I would like to know what
mesg n || true is doing. I understand that the mesg n is a do not disturb but I do not understand the || true part.
What does the || true do in the mesg command do?
 
Old 04-01-2016, 10:50 AM   #2
cepheus11
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It forces the whole expression to exit with a success status: The operator "||" means the command to the right is only executed if the command beforehand exited with a "failure status" (exit code != 0). The "true" command does nothing but exit with exit code 0 which means "success".

Last edited by cepheus11; 04-01-2016 at 10:52 AM.
 
Old 04-01-2016, 11:14 AM   #3
mikenash
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Thank You.
 
  


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