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Full Discussion: Removing letters after a certain character within a range of columns
Top Forums UNIX for Beginners Questions & Answers Removing letters after a certain character within a range of columns Post 302988798 by RudiC on Tuesday 3rd of January 2017 04:46:31 AM
Old 01-03-2017
Assuming "letters" stands for "characters", and interpreting your desired output like "remove everything in a field after the first colon", and using <TAB> as the output field separator, would this come close to what you need:
Code:
awk 'NR > 1 {for (i=1; i<=NF; i++) sub (/:.*$/, _, $i)} 1' OFS="\t" file
#CHROM    POS    ID    REF    ALT    QUAL    FILTER    INFO    FORMAT    Control1    Control2    Case1    Case2
chr1	65872	.	T	G	2480.51	.	AC=65;AN=92;SF=0,1;VRT=1	GT	1/1	0/1	0/1	.
chr1	65893	.	G	A	433.77	.	AC=7;AN=10;SF=0,1;VRT=1	.	.	0/1	0/1

EDIT: I made a typo: the loop should start at the 10. field only:
Code:
awk 'NR > 1 {for (i=10; i<=NF; i++) sub (/:.*$/, _, $i)} 1' OFS="\t" file

Last edited by RudiC; 01-03-2017 at 12:16 PM.. Reason: corrected typo...
This User Gave Thanks to RudiC For This Post:
daashti
 

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LEARN ABOUT DEBIAN

dpkg-awk

DPKG-AWK(1)						      General Commands Manual						       DPKG-AWK(1)

NAME

       dpkg-awk - Utility to read a dpkg style db file

SYNOPSIS

       dpkg-awk [(-f|--file) filename] [(-d|--debug) ##] [(-s|--sort) list] [(-rs|--rec_sep) ??] '<fieldname>:<regex>' ... -- <out_fieldname> ..

DESCRIPTION

       dpkg-awk  Parses  a  dpkg status file (or other similarly formatted file) and outputs the resulting records.  It can use regex on the field
       values to limit the returned records, it can also be told which fields to output, and it can sort the matched fields.

OPTIONS

       -f filename
       --file filename
	      The file to parse.  The default is /var/lib/dpkg/status.

       -d [#]
       --debug [#]
	      Each time this is specified, it increased the debug level.

       -s field(s)
       --sort field(s)
	      A space or comma separated list of fields to sort on.

       -n field(s)
       --numeric field(s)
	      A space or comma separated list of fields that should be interpreted as numeric in value.

       -rs ??
       --rec_sep ??
	      Output this string at the end of each output paragraph.

       -h
       --help Display some help.

       fieldname
	      The fields from the file, that are matched with the regex given.	The fieldnames are case insensitive.

       out_fieldname
	      The fields from the file, that are output for each record.  If the first field listed begins with ^, then the list  of  fields  that
	      follows will NOT be output.

BUGS

       Be  warned  that  the author has only a shallow understanding of the dpkg packaging system, so there are probably tons of bugs in this pro-
       gram.

       This program comes with no warranties.  If running this program causes fire and brimstone to rain down upon the earth, you will be on  your
       own.

       This program accesses the dpkg database directly in places, querying for data that cannot be gotten via dpkg.

AUTHOR

       Adam Heath <doogie@debian.org>

DEBIAN
								 Debian Utilities						       DPKG-AWK(1)
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