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Top Forums Shell Programming and Scripting awk to combine matching lines in file Post 302981238 by cmccabe on Thursday 8th of September 2016 05:58:43 PM
Old 09-08-2016
awk to combine matching lines in file

I am trying to combine all matching lines in the tab-delimited using awk. The below runs but no output results. Thank you Smilie.

input
Code:
chrX    110925349    110925532    ALG13
chrX    110925349    110925532    ALG13
chrX    110925349    110925532    ALG13
chrX    47433390    47433999    SYN1
chrX    47433390    47433999    SYN1
chr18    53298518    53298629    TCF4
chr18    53298518    53298629    TCF4
chr18    53298640    53298695    TCF4
chr18    53298640    53298695    TCF4

desired output
Code:
chrX    110925349    110925532    ALG13
chrX    47433390    47433999    SYN1
chr18    53298518    53298629    TCF4
chr18    53298640    53298695    TCF4

Code:
awk '!(NR){print$0p}{p=$0}' input

 

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IGAWK(1)							 Utility Commands							  IGAWK(1)

NAME
igawk - gawk with include files SYNOPSIS
igawk [ all gawk options ] -f program-file [ -- ] file ... igawk [ all gawk options ] [ -- ] program-text file ... DESCRIPTION
Igawk is a simple shell script that adds the ability to have ``include files'' to gawk(1). AWK programs for igawk are the same as for gawk, except that, in addition, you may have lines like @include getopt.awk in your program to include the file getopt.awk from either the current directory or one of the other directories in the search path. OPTIONS
See gawk(1) for a full description of the AWK language and the options that gawk supports. EXAMPLES
cat << EOF > test.awk @include getopt.awk BEGIN { while (getopt(ARGC, ARGV, "am:q") != -1) ... } EOF igawk -f test.awk SEE ALSO
gawk(1) Effective AWK Programming, Edition 1.0, published by the Free Software Foundation, 1995. AUTHOR
Arnold Robbins (arnold@skeeve.com). Free Software Foundation Nov 3 1999 IGAWK(1)
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