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Full Discussion: Change only first line of the match
Top Forums Shell Programming and Scripting Change only first line of the match Post 302881506 by Don Cragun on Monday 30th of December 2013 02:53:21 AM
Old 12-30-2013
You are not at all clear!
In your original message in this thread you said you had a file named hostsocket.txt that contains:
Code:
leprechaun.2.uri.list=leprechaun2urilist
leprechaun.3.uri.list=leprechaun3urilist
leprechaun.4.uri.list=leprechaun4urilist
leprechaun.5.uri.list=leprechaun5urilist^
leprechaun.host.uri.list=raft://rt900test.info53.com:20025
leprechaun.1.uri.list=leprechaun1urilist
leprechaun.2.uri.list=leprechaun2urilist
leprechaun.8.uri.list=leprechaun8urilist
leprechaun.9.uri.list=leprechaun9urilist
leprechaun.host.uri.list=raft://11.1.120.154:20527,raft://10.1.182.2:21527
leprechaun.4.uri.list=leprechaun4urilist
leprechaun.5.uri.list=leprechaun5urilist
leprechaun.6.uri.list=leprechaun6urilist

and that after changing one line shown in blue above and below, it should look like:
Code:
leprechaun.2.uri.list=leprechaun2urilist
leprechaun.3.uri.list=leprechaun3urilist
leprechaun.4.uri.list=leprechaun4urilist
leprechaun.5.uri.list=leprechaun5urilist
leprechaun.host.uri.list=raft://rt950test.info53.com:21250
leprechaun.1.uri.list=leprechaun1urilist
leprechaun.2.uri.list=leprechaun2urilist
leprechaun.3.uri.list=leprechaun3urilist
leprechaun.4.uri.list=leprechaun4urilist
leprechaun.5.uri.list=leprechaun5urilist
leprechaun.6.uri.list=leprechaun6urilist
leprechaun.7.uri.list=leprechaun7urilist
leprechaun.8.uri.list=leprechaun8urilist
leprechaun.9.uri.list=leprechaun9urilist
leprechaun.host.uri.list=raft://11.1.120.154:20527,raft://10.1.182.2:21527
leprechaun.4.uri.list=leprechaun4urilist
leprechaun.5.uri.list=leprechaun5urilist
leprechaun.6.uri.list=leprechaun6urilist

But, in addition to the changes marked in blue, the stuff marked in red in the original file was removed and the stuff in red in the updated file was added.

There are lots of fairly simple ways to do what your English description says you want to do. Akshay provided an awk script that comes close to producing the output you showed in your sample from your sample input, if you change:
Code:
                             gsub(/[://].*:/,"://"RAFTIP,$0)
                             gsub(/[:0-9]*$/,":"RAFTPORT,$0)

in his script to:
Code:
                             sub("//.*", "//"RAFTIP":"RAFTPORT

except that it doesn't remove the trailing circumflex from the 4th line of the input file.

The following alternative awk script seems to transform your sample input into what you said your output should be:
Code:
awk -F'[.]' '
/[.^.]$/ {      # Get rid of trailing circumflex...
        $0=substr($0,1,length($0)-1)
}
/^leprechaun[.]host[.]uri[.]list=/ {
        if(found++ == 0) {
                # Change IP address and Port on 1st matching line...
                sub("//.*", "//" RAFTIP ":" RAFTPORT)
                # Set starting sequence number for following lines.
                seq = 1
        }
        print
        next
}
found == 1 && seq <= $2 {
        end = $2
        # Insert missing lines between values between 1st and 2nd matched lines.
        while(seq <= end) {
                gsub(/[0-9]+/, seq++)
                print
        }
        next
}
{       print
}' OFS=. RAFTIP="rt950test.info53.com" RAFTPORT="21250" hostsocket.txt

Due to the considerable discrepancies between your description of what this script should do and the sample input and output provided, Akshay's script and this script make LOTS of assumptions (although his script and my script make different assumptions) that might or might not be what you want.

If you want to try this on a Solaris/SunOS system, change awk to /usr/xpg4/bin/awk, /usr/xpg6/bin/awk, or nawk.

If you give us a clear description of what you're trying to do and sample input and output that match that description, you stand a much better chance of getting a solution to your problem that doesn't waste out time. (And please use CODE tags.)
 

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