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.

Examples

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

$ ps ux | field 1-3 11 | column -t
USER      PID   %CPU  COMMAND
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
PID   %CPU  USER      COMMAND
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.

Download

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

Contributing

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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