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Full Discussion: awk gsub with variables
Top Forums UNIX for Dummies Questions & Answers awk gsub with variables Post 302779051 by Don Cragun on Tuesday 12th of March 2013 04:47:39 AM
Old 03-12-2013
If all you want to do is add a 0 after input character number 64 on lines that don't contain the string TLR, you don't need cat, cut, or gsub(); you just need awk's substr() and print functions.
 

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CUT(1)								   User Commands							    CUT(1)

NAME
cut - remove sections from each line of files SYNOPSIS
cut OPTION... [FILE]... DESCRIPTION
Print selected parts of lines from each FILE to standard output. Mandatory arguments to long options are mandatory for short options too. -b, --bytes=LIST select only these bytes -c, --characters=LIST select only these characters -d, --delimiter=DELIM use DELIM instead of TAB for field delimiter -f, --fields=LIST select only these fields; also print any line that contains no delimiter character, unless the -s option is specified -n with -b: don't split multibyte characters --complement complement the set of selected bytes, characters or fields -s, --only-delimited do not print lines not containing delimiters --output-delimiter=STRING use STRING as the output delimiter the default is to use the input delimiter --help display this help and exit --version output version information and exit Use one, and only one of -b, -c or -f. Each LIST is made up of one range, or many ranges separated by commas. Selected input is written in the same order that it is read, and is written exactly once. Each range is one of: N N'th byte, character or field, counted from 1 N- from N'th byte, character or field, to end of line N-M from N'th to M'th (included) byte, character or field -M from first to M'th (included) byte, character or field With no FILE, or when FILE is -, read standard input. AUTHOR
Written by David M. Ihnat, David MacKenzie, and Jim Meyering. REPORTING BUGS
Report cut 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 cut is maintained as a Texinfo manual. If the info and cut programs are properly installed at your site, the command info coreutils 'cut invocation' should give you access to the complete manual. GNU coreutils 7.1 July 2010 CUT(1)
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