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Unable to store "python --version" to a shell variable


 
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# 1  
Old 05-26-2014
Unable to store "python --version" to a shell variable

Hi All,
I need to get the version of python installed and store it in a variable for later use. Whereas it is printing on the console instead of storing to variable. I am able to store output of ls command in a variable. Please check the below code :
Code:
root@myhost:/volumes/srini# cat python_version.sh 
python_version=python --version
echo "****"
echo $python_version
echo "****"
ls_output=ls -l python*
echo "****"
echo $ls_output
echo "****"

Please check the output of the code :
Code:
root@myhost:/volumes/srini# ./python_version.sh 
Python 2.6.8
****

****
****
-rwxr-xr-x 1 root root 147 May 26 09:35 python_version.sh
****

Please note, its able to store output of ls command in a variable, but not of python --version. Its directly displaying in console.

Regards,
Srinivasan

Last edited by srinivasan.neel; 05-26-2014 at 10:35 AM.. Reason: sorry for the typo, even after changing that also its not getting stored in variable
# 2  
Old 05-26-2014
Code:
echo $python_verison

Hehe typos!
# 3  
Old 05-26-2014
Ok what shell are you using, because so far not knowing I cant reply because of its behaviour: In shells I use (sh ksh...) your variable affectation would not work, and so you would not have any output for your ls part either

this is what I would have written:
Code:
python_version=$(python --version)
echo "****"
echo $python_version
echo "****"
ls_output=$(ls -l python*)
echo "****"
echo $ls_output
echo "****"


Last edited by vbe; 05-26-2014 at 11:47 AM.. Reason: typos
# 4  
Old 05-26-2014
If you're using bash/sh or similar shells this will capture the python version number in a variable.

Code:
xx=$(python --version 2>&1)

The output is being sending to stderr, which is why you need the "2>&1".
This User Gave Thanks to cnamejj For This Post:
# 5  
Old 05-27-2014
Thanks a lot cnamejj. I am using bash shell and redirection of stderr worked.

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