Python : execute Linux commands in python by using popen2 or subprocess

small tips.
Here’s an example of how to use popne2 / subprocess .

# python --version Python 2.7.3

[ use popne2 ]

nnn , the output includes empty lines..

# python Python 2.7.3 (default, Sep 26 2012, 21:51:14) [GCC 4.7.2] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> import popen2 >>> cmd1 = 'ls -a' >>> stdout_cmd1,stdin_cmd1,stderr_cmd1 = popen2.popen3(cmd1) >>> for i in stdout_cmd1.readlines(): ...     print i ... . .. .ICEauthority     <- empty line .Xauthority     <- empty line .Xmodmap .aptitude .bash_history .cache .config <snip> >>>

to remove empty lines , use rstrip() method.

>>> stdout_cmd1,stdin_cmd1,stderr_cmd1 = popen2.popen3(cmd1) >>> for i in stdout_cmd1.readlines(): ...     print i.rstrip() ... . .. .ICEauthority .Xauthority .Xmodmap .aptitude .bash_history .cache .config .dbus .gconf .gnome2 .gns3 .gstreamer-0.10 .gtk-bookmarks .guestfish .gvfs .john .lesshst .linuxmint .local .mateconf .mateconfd .mbrowse .mbrowse_bookmarks .msf4 .pki .profile .pulse .pulse-cookie .rnd .scapy_history .selected_editor .spicec .ssh .synaptic .toprc .virsh .virt-manager .virtinst .vnc .w3af .xsession-errors Desktop Documents Downloads Music Pictures Public Templates Videos

[ use subprocess ]

# python Python 2.7.3 (default, Sep 26 2012, 21:51:14) [GCC 4.7.2] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> import subprocess >>> cms1 = 'ls -a' >>> for i in result_cmd1.stdout.readlines(): ...     print i.rstrip() ... . .. .ICEauthority .Xauthority .Xmodmap .aptitude .bash_history .cache .config .dbus .gconf .gnome2 .gns3 .gstreamer-0.10 .gtk-bookmarks .guestfish .gvfs .john .lesshst .linuxmint .local .mateconf .mateconfd .mbrowse .mbrowse_bookmarks .msf4 .pki .profile .pulse .pulse-cookie .rnd .scapy_history .selected_editor .spicec .ssh .synaptic .toprc .virsh .virt-manager .virtinst .vnc .w3af .xsession-errors Desktop Documents Downloads Music Pictures Public Templates Videos >>>