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Shell Programming and Scripting
Reverse specific field number
Post 302959294 by RudiC on Saturday 31st of October 2015 06:45:17 AM
10-31-2015
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Hi Everyone,
I have one a.txt:
a b 001 c
b b 002 c
c c, not 002 c
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002
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If i use cut -f 3 -d' ', this does not work on the 3rd line, so i thought is any way to cut the field counting from the end? or any perl thing can do this?:confused:
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LEARN ABOUT SUSE
uniq
UNIQ(1) User Commands UNIQ(1) NAME
uniq - report or omit repeated lines SYNOPSIS
uniq [OPTION]... [INPUT [OUTPUT]] DESCRIPTION
Discard all but one of successive identical lines from INPUT (or standard input), writing to OUTPUT (or standard output). Mandatory arguments to long options are mandatory for short options too. -c, --count prefix lines by the number of occurrences -d, --repeated only print duplicate lines -D, --all-repeated[=delimit-method] print all duplicate lines delimit-method={none(default),prepend,separate} Delimiting is done with blank lines. -f, --skip-fields=N avoid comparing the first N fields -i, --ignore-case ignore differences in case when comparing -s, --skip-chars=N avoid comparing the first N characters -u, --unique only print unique lines -z, --zero-terminated end lines with 0 byte, not newline -w, --check-chars=N compare no more than N characters in lines --help display this help and exit --version output version information and exit A field is a run of blanks (usually spaces and/or TABs), then non-blank characters. Fields are skipped before chars. Note: 'uniq' does not detect repeated lines unless they are adjacent. You may want to sort the input first, or use `sort -u' without `uniq'. AUTHOR
Written by Richard M. Stallman and David MacKenzie. REPORTING BUGS
Report uniq bugs to bug-coreutils@gnu.org GNU coreutils home page: <http://www.gnu.org/software/coreutils/> General help using GNU software: <http://www.gnu.org/gethelp/> COPYRIGHT
Copyright (C) 2009 Free Software Foundation, Inc. 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. SEE ALSO
The full documentation for uniq is maintained as a Texinfo manual. If the info and uniq programs are properly installed at your site, the command info coreutils 'uniq invocation' should give you access to the complete manual. GNU coreutils 7.1 July 2010 UNIQ(1)