topic Re: script in Operating System - Linux

script

Chapaya — Tue, 03 Mar 2009 08:02:10 GMT

Is there a way to append a new string to a line which is in the middle of a file.

For eg: below is my file
first line of text
second line of text
third line of text
fourth line of text

i want a output like this:
first line of text
second line of text New string added here
third line of text
fourth line of text

Re: script

Fredrik.eriksson — Tue, 03 Mar 2009 10:05:17 GMT

Hi

One way is doing like this.
# sed -e "/second line/ a\test" temp
first line of text
second line of text
test
third line of text
fourth line of text

Another if you know specific row number.
# sed -e "2 a\test" temp
first line of text
second line of text
test
third line of text
fourth line of text

The above version is just search and add, make sure (if you're going to use that) that you have a exact match.

Otherwise you can end up like this:
# sed -e "/text/ a\test" temp
first line of text
test
second line of text
test
third line of text
test
fourth line of text
test

Best regards
Fredrik Eriksson

Re: script

Wilfred Chau_1 — Mon, 09 Mar 2009 17:05:31 GMT

assuming your text is in myfile. This command will append "new string" including a new line character to end of line that matches "third line of text" and then redirect the result to "newfile"

perl -ne 'if ($_ =~ /^third line of text/i) {$_ =~ s/[\r\n]+//; $_ .= " new string\n";} print "$_";' myfile > newfile

Re: script

Ciro Iriarte — Mon, 09 Mar 2009 17:11:30 GMT

That would add a new line to the stream, this would append a string to the line that matches in the stream:

sed -e "/second line of text/ s/.*/& New string added here/" test

Regards,

Re: script

Chapaya — Tue, 10 Mar 2009 06:21:20 GMT

thanks all.