Field - extract fields from a file

I recently put the final touches on a python project I’ve been working on since February, and I am happy to announce the 0.2.0 release of field!

field is a command-line application for extracting fields from files. It was written to be a simpler version of awk '{ print COLUMN; ... }', and address some of the shortcomings of cut, such as field ordering, whitespace squashing, and repeated output.


Extract the user, pid, cpu percent, and command from ps:

$ ps ux | field 1-3 11 | column -t
bramwelt  2157  0.0   /usr/bin/gnome-keyring-daemon
bramwelt  2161  0.0   i3
bramwelt  2195  0.0   xscreensaver
bramwelt  2196  0.0   nm-applet

Extract pid, cpu percent, pid, and command (in that order):

$ ps ux | field 2,3,1,11 | column -t
2157  0.0   bramwelt  /usr/bin/gnome-keyring-daemon
2161  0.0   bramwelt  i3
2195  0.0   bramwelt  xscreensaver
2196  0.0   bramwelt  nm-applet

Extract user, shell, homedir, uid and gid from /etc/passwd using ‘:’ as the delimiter:

$ field -f /etc/passwd -d':' 1 7-6 4,3 | column -t
root    /bin/bash          /root      0      0
daemon  /usr/sbin/nologin  /usr/sbin  1      1
bin     /usr/sbin/nologin  /bin       2      2
sys     /usr/sbin/nologin  /dev       3      3
sync    /bin/sync          /bin       65534  4

Further examples can be found in field’s manpage.


field can be installed using pip:

virtualenv field && source field/bin/activate
pip install field

For a site-wide install, use:

sudo pip install field


Field is free software and licensed under the GLPv3 (or later). The source can be found on github. If you find any bugs or would like to suggest improvements, please submit an issue and I’ll do my best to address it!

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