in reply to Can't rename
In case you have no clue why something doesn't work, just add debug print statements everywhere, so you can see what is the problem.
My guesses are: file1.htm is not in $ENV{DOCUMENT_ROOT}, or your webdaemon user (apache, www, nobody...) doesn't have sufficient rights to write to $ENV{DOCUMENT_ROOT}
Besides that, you can also skip the chdir() command and try it with the use of full path names in the rename() command. Something like:
$a = "$ENV{DOCUMENT_ROOT}/file1.htm"; $b = "$ENV{DOCUMENT_ROOT}/file2.htm"; rename($a, $b) || die "Uh oh, can't rename: $!";
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