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Full Discussion: comment/delete a particular pattern starting from second line of the matching pattern
Top Forums Shell Programming and Scripting comment/delete a particular pattern starting from second line of the matching pattern Post 302246122 by imas on Monday 13th of October 2008 12:00:25 AM
Old 10-13-2008
Yes your assumption is correct and this is a real world problem

What iam trying to do is commenting the duplicate Ip's found in the text file ignoring the first occurance as to be valid IP for a valid mac and from the second occurance onwards commenting the duplicate IPs at the starting of the line.

file 1.txt with following entries as shown:

0152364|134444|10.20.30.40|015236433
0233654|122555|10.20.30.50|023365433
**
**
**

file 2.txt with following entries as shown:

0152364|134444|10.20.30.40|015236433
0233654|122555|10.20.30.50|023365433
0789456|332211|10.20.30.40|078945633
1234567|225522|10.20.30.50|123456733
0321654|999999|10.20.30.40|032165433
0456123|777899|10.20.30.40|045612333
***
***
***

i need to have the following output in 2.txt as shown:

0152364|134444|10.20.30.40|015236433
0233654|122555|10.20.30.50|023365433
#0789456|332211|10.20.30.40|078945633
#1234567|225522|10.20.30.50|123456733
#0321654|999999|10.20.30.40|032165433
#0456123|777899|10.20.30.40|045612333
***
***
***

The correct script i wrote is

for i in `cat 1.txt |cut -d"|" -f3`
do
cat 2.txt |sed "s/^\(.*\|$i\|.*)/#\1/g" > tmp.txt
mv tmp.txt 2.txt
done

But the above script will comment all the occurance.

Your help is appreciated.

Thanks
-imas
 

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LEARN ABOUT OPENDARWIN

tcl_stringcasematch

Tcl_StringMatch(3)					      Tcl Library Procedures						Tcl_StringMatch(3)

__________________________________________________________________________________________________________________________________________________

NAME

       Tcl_StringMatch, Tcl_StringCaseMatch - test whether a string matches a pattern

SYNOPSIS

       #include <tcl.h>

       int
       Tcl_StringMatch(string, pattern)

       int
       Tcl_StringCaseMatch(string, pattern, nocase)

ARGUMENTS

       char	    *string	       (in)	 String to test.

       char	    *pattern	       (in)	 Pattern to match against string.  May contain special characters from the set *?[].

       int	    nocase	       (in)	 Specifies whether the match should be done case-sensitive (0) or case-insensitive (1).
_________________________________________________________________

DESCRIPTION

       This  utility  procedure  determines  whether  a  string  matches  a given pattern.  If it does, then Tcl_StringMatch returns 1.  Otherwise
       Tcl_StringMatch returns 0.  The algorithm used for matching is the same algorithm used in the ``string match'' Tcl command and  is  similar
       to the algorithm used by the C-shell for file name matching;  see the Tcl manual entry for details.					   |

       In  Tcl_StringCaseMatch,  the algorithm is the same, but you have the option to make the matching case-insensitive.  If you choose this (by |
       passing nocase as 1), then the string and pattern are essentially matched in the lower case.

KEYWORDS

       match, pattern, string

Tcl									8.1							Tcl_StringMatch(3)
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