field - extract fields from a file
field [-h] [-f FILE] [-d DELIMITER] [FIELD ...]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
Field was written to address two short comings of cut:
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.
Field Ordering
Fields extracted by cut are not listed in the order they are passed.
$ 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 nosuidWritten by Trevor Bramwell.
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.