Running commands through a system shell

Look at envoy first. envoy.run(command) waits for completion before returning output, which is not what you need when wrapping long running tools, where output needed as soon as it appears, shellrun.run(command) does not intercept output - there is a separate command for that.

>>> import shellrun
>>> r = shellrun.run('uptime')
 04:06:37 up 2 min,  1 user,  load average: 0.20, 0.19, 0.08
>>> r.output
>>> r.success
True
>>> r.retcode
0

To capture output envoy-style, use run_capture. stdout and stderr are merged, because that’s how users see it:

>>> r = shellrun.run_capture('uptime')
>>> r.output
' 04:07:16 up 2 min,  1 user,  load average: 0.11, 0.17, 0.08\n'
>>> r.success
True
>>> r.retcode
0

Quick comparison of result objects:

Example of .success usage:

from shellrun import run_capture

r = run_capture('ls -la')
if r.success:
    print(r.output)
else:
    print("Error: '%s' exit code %s" % (r.command, r.retcode))
    print("         ...")
    # print last three lines of output
    for line in r.output.splitlines()[-3:]:
        print("       %s" % line)