I have python program, which is running from shell. When there is an error in python, it will exit with exit(1) or something else, and I need shell program to get that answer, if there is error, run this program again.
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Are you writing a shell script?user2357112– user23571122014-01-10 09:06:58 +00:00Commented Jan 10, 2014 at 9:06
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both, python program and shell scriptEmin Mastizada– Emin Mastizada2014-01-10 09:52:22 +00:00Commented Jan 10, 2014 at 9:52
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Yes, but the real question is about shell scripting.glglgl– glglgl2014-01-10 10:01:33 +00:00Commented Jan 10, 2014 at 10:01
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@glglgl yes, but i mentioned python because there can be something special for python.Emin Mastizada– Emin Mastizada2014-01-10 13:26:25 +00:00Commented Jan 10, 2014 at 13:26
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2 Answers
There is nothing special about Python in this case. You capture the exit code as with any other program:
- either you evaluate
$?where you have this code directly, as in sanyi's answer, or you embed the program call in an
iforwhilecondition, where its non-zero-ness is checked:if ! python yourprogram.py; then dosomething fi
1 Comment
Emin Mastizada
When i searched for this, in most places they called shell script from python, and its not good solution for my project. And I don't have a lot experience with shell scripts.
The exit code can be found in the $? See the example:
python yourprogram.py
if [[ $? != 0 ]] ; then
dosomething
fi
3 Comments
Emin Mastizada
Thanks a lot. So, shell script automatically gets exit number, i used it with while $? = 1 and it works now very good.
glglgl
@EminMastizada I would work close to the standard and not check for
== 1, but for != 0 indeed. Usually, an exit code of 0 means success, any other value means failure or a special condition, where the meaning of each value is defined by the called program. So if you just want to check for failure, do that. Only check for = 1 if the 1 has another meaning than 2 would have.glglgl
(Especially as the OP says "or something else", so the exit code isn't limited to 1, it can also have other values.)