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Top Forums Shell Programming and Scripting hot to specify the last column in sed? Post 302207733 by fedora on Friday 20th of June 2008 04:03:23 PM
Old 06-20-2008
the thing is the last column of the file test is special, it may have something like "aaMM", which will be YYMM after the replacement, or "aaYY", which will be YYYY after the replacement, we can not just replace YY$ back to aa here.

Quote:
Originally Posted by robotronic
With GNU sed you may try something like this:

Code:
sed "s/\baa\b/YY/g; s/YY$/aa/" input_file.txt

No better ideas... For now Smilie
 

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SHTOOL-TABLE.TMP(1)					      GNU Portable Shell Tool					       SHTOOL-TABLE.TMP(1)

NAME
shtool-table - GNU shtool pretty-print a field-separated list SYNOPSIS
shtool table [-F|--field-sep sep] [-w|--width width] [-c|--columns cols] [-s|--strip strip] strsepstr... DESCRIPTION
This pretty-prints a list of strings as a table. OPTIONS
The following command line options are available. -F, --field-sep sep Separate columns using sep. Default is ":". -w, --width width Width of each column. Default is 15 characters. -c, --columns cols Number of columns. Default is 3. -s, --strip strip Strip off any characters past strip. Default is 79. EXAMPLE
# shell script shtool table -F , -w 5 -c 4 "1,2,3,4,5,6,7,8,9,10,11,12" HISTORY
The GNU shtool table command was originally written by Ralf S. Engelschall <rse@engelschall.com> in 1999 for GNU shtool. SEE ALSO
shtool(1), tr(1), fmt(1), sh(1), awk(1), sed(1). 18-Jul-2008 shtool 2.0.8 SHTOOL-TABLE.TMP(1)
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