You can't insert into the middle of a file as it is a single logical contiguous unit. The easiest way to do this is to read it in, printing out each line to a temp file (say called file.txt.upadate) until the insert point, then print the addition to this temp file, then the rest. Lastly rename the temp file to the original file name to replace the old file in a unitary operation that is all or nothing - it works or it fails. No half measures and corrupt files.

while (<OLD>) {
    insert() if /something/;
    print TMP $_;
}

sub insert { print TMP, $insert }

rename $tmp, $old or die "Can't rename $tmp to $old, Perl whines $!\n"
+;
[download]

cheers

tachyon

s&&rsenoyhcatreve&&&s&n.+t&"$'$`$\"$\&"&ee&&y&srve&&d&&print

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