Python 2.7 passing variable into subprocess command line

Question

I want to use a variable and pass it on to shell command line. Problem is. I don't know how. Need help.

 def gauti():
    imti=tekstas.get("1.0", "end-1c")
    subprocess.call("grep -i 'imti' /var/log/syslog > logas.txt", shell=True)

Instead of 'imti' I need a variable that would be delivered in python program to be searched in syslog file.

mic4ael · Accepted Answer · 2017-03-29 13:58:35Z

1

Use string formatting

subprocess.call("grep -i '{imti}' /var/log/syslog > logas.txt".format(imti=imti), 
                shell=True)

or pass array to call method with all required parts

logas = open('logas.txt', 'a+')
subprocess.call(['grep', '-i', imti, '/var/log/syslog'], stdout=logas)

answered Mar 29, 2017 at 13:58

mic4ael

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