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    <p>You could read the file in as a single string and then use a regular expression to do the search and replace:</p> <pre><code>use strict; use warnings; # Slurp file myfile.txt into a single string open(FILE,"myfile.txt") || die "Can't open file: $!"; undef $/; my $file = &lt;FILE&gt;; # Set strings to find and insert my $first_line = ")"; my $second_line = "NIC Hr_Nic ("; my $insert = "hello world"; # Insert our text $file =~ s/\Q$first_line\E\n\Q$second_line\E/$first_line\n$insert\n$second_line/; # Write output to output.txt open(OUTPUT,"&gt;output.txt") || die "Can't open file: $!"; print OUTPUT $file; close(OUTPUT); </code></pre> <p><a href="http://oreilly.com/catalog/cookbook/chapter/ch08.html" rel="nofollow noreferrer">By unsetting <code>$/</code> we put Perl into "slurp mode"</a> and so can easily read the whole file into <code>$file</code>.</p> <p>We use <a href="http://perldoc.perl.org/perlop.html#Regexp-Quote-Like-Operators" rel="nofollow noreferrer">the <code>s///</code> operator</a> to do a search and replace using our two search lines as a pattern.</p> <p>The <code>\Q</code> and <code>\E</code> tell Perl to escape the strings between them, i.e. to ignore any special characters that happen to be in <code>$first_line</code> or <code>$second_line</code>.</p> <p>You could always write the output over the original file if desired.</p> <p>The problem as you state it is not solvable using <a href="http://perldoc.perl.org/perlrun.html#Command-Switches" rel="nofollow noreferrer">the <code>-i</code> command line option</a> since this option processes a file one line at a time; to insert text between two specific lines you'll need to know about two lines at once.</p>
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    1. COTHX , another remark how to edit the file itself without to copy the edit on another file? (maybe with option i)
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      1. USlidia
    2. CO@lidia - have responded to your comments in an edit of the answer - but I don't think you can do it with `-i`.
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    3. COhi Dave THX allot , another question I have many text lines as insert1="something" , insert2="other ..." , insert3=...." ( what the best thing to do if I want to add all texts in to the file
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