On Tuesday, February 12, 2013 6:13:38 AM UTC+1, contro opinion wrote: > >>> import os > >>> os.system("i=3") > 0 > >>> os.system("echo $i") > > > 0 > how can i get the value of i? You may want to take a look at the pexcpect module : http://www.noah.org/wiki/pexpect