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Top Forums UNIX for Advanced & Expert Users Copy a column to another column in UNIX fixedwidth file Post 302747101 by RudiC on Thursday 20th of December 2012 02:09:33 PM
Old 12-20-2012
Not sure if all systems / awk versions will support that large numbers which might be well beyond LINE_MAX (check with getconf LINE_MAX -> 2048). I didn't test this one with looong lines, you may try yourself:
Code:
$ awk '{for (i=to;i<to+4;i++)$i=$(i-back)}1' to=30 back=10 FS="" OFS="" file

It replaces 4 chars at the "to" location with the chars "back" earlier... In your request, "to" would be 1127, and "back" were -551 ... you may want to play around with the signs and operators...
 

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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). ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +--------------------+-----------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +--------------------+-----------------+ |Availability | SUNWgawk | +--------------------+-----------------+ |Interface Stability | Volatile | +--------------------+-----------------+ NOTES
Source for gawk is available on http://opensolaris.org. Free Software Foundation Nov 3 1999 IGAWK(1)
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