On Unix shell=True
implies that 2nd and following arguments are for the shell itself, use a string to pass a command to the shell:
import subprocess
cmd = 'echo $HOME'
proc = subprocess.Popen(cmd, shell=True, stdout=subprocess.PIPE)
print proc.communicate()[0],
You could also write it as:
import subprocess
cmd = 'echo $HOME'
print subprocess.check_output(cmd, shell=True),
From the subprocess' docs:
On Unix with shell=True
, the shell defaults to /bin/sh. If args is a
string, the string specifies the command to execute through the shell.
This means that the string must be formatted exactly as it would be
when typed at the shell prompt. This includes, for example, quoting or
backslash escaping filenames with spaces in them. If args is a
sequence, the first item specifies the command string, and any
additional items will be treated as additional arguments to the shell
itself. That is to say, Popen does the equivalent of:
Popen(['/bin/sh', '-c', args[0], args[1], ...])
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