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Top Forums UNIX for Dummies Questions & Answers Help in replacing column values Post 302940297 by Scrutinizer on Friday 3rd of April 2015 04:56:44 AM
Old 04-03-2015
You could try:
Code:
sed 's/^\(.\{8\}150\)8/\17/; s/^\(.\{8\}150\)9/\18/' file

(the order is important)

or if it is always the field value -1, try awk:
Code:
awk '{print substr($0,1,8) sprintf("%04d", substr($0,9,4)-1) substr($0,13)}' file

or gawk:
Code:
gawk '{$2=sprintf("%04d", $2-1)}1' FIELDWIDTHS="8 4 999" OFS= file

This User Gave Thanks to Scrutinizer For This Post:
 

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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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