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Top Forums Shell Programming and Scripting remove duplicate lines using awk Post 302492301 by sudvishw on Monday 31st of January 2011 01:18:59 AM
Old 01-31-2011
remove duplicate lines using awk

Hi,
I came to know that using
Code:
awk '!x[$0]++'

removes the duplicate lines. Can anyone please explain the above syntax. I want to understand how the above awk syntax removes the duplicates.

Thanks in advance,
sudvishw Smilie
 

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MSGUNIQ(1)								GNU								MSGUNIQ(1)

NAME
msguniq - unify duplicate translations in message catalog SYNOPSIS
msguniq [OPTION] [INPUTFILE] DESCRIPTION
Unifies duplicate translations in a translation catalog. Finds duplicate translations of the same message ID. Such duplicates are invalid input for other programs like msgfmt, msgmerge or msgcat. By default, duplicates are merged together. When using the --repeated option, only duplicates are output, and all other messages are discarded. Comments and extracted comments will be cumulated, except that if --use-first is specified, they will be taken from the first translation. File positions will be cumulated. When using the --unique option, duplicates are discarded. Mandatory arguments to long options are mandatory for short options too. Input file location: INPUTFILE input PO file -D, --directory=DIRECTORY add DIRECTORY to list for input files search If no input file is given or if it is -, standard input is read. Output file location: -o, --output-file=FILE write output to specified file The results are written to standard output if no output file is specified or if it is -. Message selection: -d, --repeated print only duplicates -u, --unique print only unique messages, discard duplicates Input file syntax: -P, --properties-input input file is in Java .properties syntax --stringtable-input input file is in NeXTstep/GNUstep .strings syntax Output details: -t, --to-code=NAME encoding for output --use-first use first available translation for each message, don't merge several translations -e, --no-escape do not use C escapes in output (default) -E, --escape use C escapes in output, no extended chars --force-po write PO file even if empty -i, --indent write the .po file using indented style --no-location do not write '#: filename:line' lines -n, --add-location generate '#: filename:line' lines (default) --strict write out strict Uniforum conforming .po file -p, --properties-output write out a Java .properties file --stringtable-output write out a NeXTstep/GNUstep .strings file -w, --width=NUMBER set output page width --no-wrap do not break long message lines, longer than the output page width, into several lines -s, --sort-output generate sorted output -F, --sort-by-file sort output by file location Informative output: -h, --help display this help and exit -V, --version output version information and exit AUTHOR
Written by Bruno Haible. REPORTING BUGS
Report bugs to <bug-gnu-gettext@gnu.org>. COPYRIGHT
Copyright (C) 2001-2005 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICU- LAR PURPOSE. SEE ALSO
The full documentation for msguniq is maintained as a Texinfo manual. If the info and msguniq programs are properly installed at your site, the command info msguniq should give you access to the complete manual. GNU gettext-tools 0.14.4 April 2005 MSGUNIQ(1)
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