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Old 10-19-2005, 12:14 PM   #1
kushalkoolwal
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difference between exit 1 and exit


I learned that a proper way to exit from a shell script is by giving 'exit' in your shell script. Now, in some shell script examples I have seen people using 'exit 1' also.

What is the difference between these two i.e. 'exit' and 'exit 1'?

Thanks
 
Old 10-19-2005, 12:40 PM   #2
itsme86
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Quote:
NAME
exit - End the application

SYNOPSIS
exit <returnCode>

DESCRIPTION
Terminate the process, returning returnCode to the system
as the exit status. If returnCode isn't specified then it
defaults to 0.
Exit codes are useful to programs that call your program. If your program finishes with exit code 0 then that generally means your program "succeeded". An exit code of 1 generally means that it failed. Maybe the program tried to open a file that didn't exist or something. This would tell the calling program that it might not want to continue.
 
Old 10-19-2005, 01:06 PM   #3
kushalkoolwal
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Thank you for providing the information.

How can I check the exit status code from my shell script?

Also, where did you find out that man page like description of the 'exit' command. I tried 'man exit' on my system but it did not find anything.
 
Old 10-19-2005, 01:08 PM   #4
itsme86
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Try 'man n exit'.
 
Old 10-20-2005, 03:21 PM   #5
ioerror
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Quote:
How can I check the exit status code from my shell script?
The $? env var holds the exit value of the last command.
 
Old 10-20-2005, 03:49 PM   #6
lowpro2k3
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Quote:
Originally posted by ioerror
The $? env var holds the exit value of the last command.
yep.

[shell]$ ./yourscript
output...
[shell]$ echo $?
0
[shell]$
 
Old 10-20-2005, 03:56 PM   #7
ioerror
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Also, in zsh, one can put %? in PS1, so you get the exit value of the last command in the prompt (I do this). I don't know if bash has a similar option.
 
  


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