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Full Discussion: formatting a file and removing duplicates
Top Forums Shell Programming and Scripting formatting a file and removing duplicates Post 302561953 by Corona688 on Wednesday 5th of October 2011 03:12:58 PM
Old 10-05-2011
Code:
$ awk 'BEGIN { ORS=", " } !A[$1]++' < data
HI, Joe, Bob, Jack, 
$

First, we set ORS=", " so it prints ", " instead of \n for each "line".

The next is an expression telling it when to print. If it was '1', it'd print an item for each and every line of input. If it was 0, it'd print nothing at all.

The expression !A[$1]++ tells it to print the entire line only when the line's first field ($1) hasn't been found before. So the first time it looks for Jack, it sees that A["Jack"] is zero and prints. The ++ then adds 1 to that. Next time, it sees A["Jack"] is 1 and skips printing it.
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LEARN ABOUT DEBIAN

zita-rev1

ZITA-REV1(1)						      General Commands Manual						      ZITA-REV1(1)

NAME

       zita-rev1 - pro-audio reverb effect

SYNOPSIS

       zita-rev1 [options]

DESCRIPTION

       REV1 is a reworked version of the reverb originally developed for Aeolus.  Its character is more 'hall' than 'plate', but it can be used on
       a wide variety of instruments or voices. It is not a spatialiser - the early reflections are different for the L and R inputs, but  do  not
       correspond to any real room. They have been tuned to match left and right sources to some extent.

       In  Stereo  mode a dry/wet mix control is provided, so it can be used either as an insert or in send/return mode. For mono just connect one
       of the two channels.

       In Ambisonic mode (selected by the -B command line option) the only option is the send/return mode.

OPTIONS

       -B     Ambisonic mode

       -name name
	      Jack client name

       -s server
	      Jack server name

       -g geometry
	      Window position

       -h     Display this text

SEE ALSO

       A quick guide is available at <http://kokkinizita.linuxaudio.org/linuxaudio/zita-rev1-doc/quickguide.html>

AUTHOR

       zita-rev1 was written by Fons Adriaensen <fons@linuxaudio.org>.

       This manual page was written by Alessio Treglia <alessio@debian.org> for the Debian project (but may be used by others).

								     May 2011							      ZITA-REV1(1)
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