Extract fields from a file
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README.rst

Name

field - extract fields from a file

SYNOPSIS

field [-h] [-f FILE] [-d DELIMITER] [FIELD ...]

DESCRIPTION

field extracts a list of fields from a file. It is a simpler version of:

awk '{ print $5,$3,$1; }'

and similar scripts. Whitespace delimited (space and tab) fields are read from stdin and written to stdout.

FIELD is assumed to be 1-indexed integer, separated by commas and/or spaces, and take the following form:

N a single field.

N-M a range of increasing or decreasing fields from N to M.

-h, --help
show concise list of options and exit
--version
display version information and exit
-f, --file FILE
an explicit file to extract fields
-d, --delimiter DELIMITER
character delimiter between fields

NOTES

Field was written to address two short comings of cut:

  1. Default Behavior

    The default delimiter of cut is tab. Most command line utilities produce output delimited by whitespace, which includes spaces. Field takes this into account and defaults the delimiter to both tab and space characters.

  2. Field Ordering

    Fields extracted by cut are not listed in the order they are passed.

EXAMPLES

$ mount | field 5 3 1
ext4 / /dev/mapper/sda7_crypt
proc /proc proc
sysfs /sys sysfs
$ ls -l /usr/local/bin/ | field 1 9
-rwxr-xr-x airbrake*
-rwxr-xr-x bayes.rb*
-rwxr-xr-x bourbon*
$ cat /etc/mtab | cut -d' ' -f 4 | field -d',' 1 4 3 2
rw gid=5 nosuid noexec
rw size=10% nosuid noexec
rw nodev nosuid noexec
rw user=root nodev nosuid

AUTHOR

Written by Trevor Bramwell.

COPYRIGHT

Copyright (C) 2015 Trevor Bramwell License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>. This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.