CODEWITHSUNDEEP
pythonsubprocesspopen
wheisenberg
wheisenberg

Reputation: 227

Popen is no able to process a command that runs in shell

I have already read the previous questions posted on the same argument but I really haven't figured it out yet.

I am trying to run a command that works without issues from the command line :

xyz@klm:~/python-remoteWorkspace/PyLogParser/src:18:43>ush -o PPP -p PRD -n log 'pwd'
6:43PM PPP:prd:lgsprdppp:/ama/log/PRD/ppp

but when I do the same in python I always get errors :

stringa = Popen(["ush -o PPP -p PRD -n log 'pwd'"], stdout=PIPE, stdin=PIPE).communicate()[0]

Here the error.

Traceback (most recent call last):   File "getStatData.py", line 134, in <module>
    retrieveListOfFiles(infoToRetList)   File "getStatData.py", line 120, in retrieveListOfFiles
    stringa = Popen(["ush -o PPP -p PRD -n log 'pwd'"], stdout=PIPE, stdin=PIPE).communicate()[0]   File "/opt/python-2.6-64/lib/python2.6/subprocess.py", line 595, in __init__
    errread, errwrite)   File "/opt/python-2.6-64/lib/python2.6/subprocess.py", line 1092, in _execute_child
    raise child_exception OSError: [Errno 2] No such file or directory

I've tried also different solutions like

stringa = Popen(["ush", "-o", "PPP", "-p" "PRD", "-n", "log", '"pwd"'], stdout=PIPE, stdin=PIPE).communicate()[0]

but nothing seems to work. I have also tried to put the absolute path to ush but nothing... Can somebody please explain me what am I doing wrong ?

Thanks in advance, AM.

EDIT : I have a strange thing happening, when I do

which ush

I get

ush: aliased to nocorrect /projects/aaaaaaa/local/ush/latest/ush.py

But why is it working then ???

!!! Thank you all for the answers !!!

Upvotes: 0

Views: 653

Answers (2)

ephemient
ephemient

Reputation: 204758

Popen(["ush", "-o", "PPP", "-p", "PRD", "-n", "log", "pwd"])

should be right. The extra quoting around 'pwd' in the shell command makes it a single argument, but the quotes aren't actually passed along. Since you're already splitting the arguments, leave the extra quotes out.

Apparently (in an update from OP) ush is a shell alias. Thus, it only expands in the shell; anywhere else, it won't work. Expand it yourself:

Popen(["nocorrect", "/projects/aaaaaaa/local/ush/latest/ush.py",
       "-o", "PPP", "-p", "PRD", "-n", "log", "pwd"])

Upvotes: 2

Bryan Oakley
Bryan Oakley

Reputation: 385970

If ush on your system is an alias, popen won't work. popen requires an executable file as the first parameter: either an absolute path or the name of something that is in your PATH.

Upvotes: 1

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