Question

I am trying to execute the following command line via Python.

Cat File |grepcidr -f file.name >>output.file

if I use subprocess.call

subprocess.call(["cat", "File", "|", "grepcidr -f", "file.name", ">>output.file"])

It just tries to Cat everything.

Any help would be appreciated.

Answer 1

Trivial but non-portable way:

subprocess.call(["/bin/sh","-c","cat File | grepcidr -f file.name >>output.file"])

It requires /bin/sh, which should not be a problem if you rely on cat anyway. I think it’s possible to build a family of cooperating subprocesses yourself: you’d have to do what /bin/sh does with pipes and redirections, but in python.