CODEWITHSUNDEEP
pythonlinuxshelltimesubprocess
user3078254
user3078254

Reputation: 33

Subprocess calls the wrong version of 'time'

I'm trying to call the shell keyword version of 'time' via 

subprocess.check_output('time ls',stderr=subprocess.STDOUT,shell=True)

this is giving me the output (which is /usr/bin/time output):

0.00user 0.00system 0:00.00elapsed ?%CPU (0avgtext+0avgdata 1992maxresident)k
0inputs+0outputs (0major+85minor)pagefaults 0swaps

rather than the shell keyword output:

real    0m0.001s
user    0m0.000s
sys     0m0.000s

For some reason subprocess.check_output is using the /usr/bin/time version of time.

Could someone tell me what is happening here? Thank you.

Upvotes: 0

Views: 80

Answers (1)

J. P. Petersen
J. P. Petersen

Reputation: 5031

It is because time is a also a built in function in Bash. So you need to specify that you want to use Bash as your shell:

print subprocess.check_output('time ls', stderr=subprocess.STDOUT,\
    shell=True, executable='/bin/bash')

Upvotes: 2

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