truncate

See the current Perl documentation for truncate.

Here is our local, out-dated (pre-5.6) version:

truncate - shorten a file

truncate FILEHANDLE,LENGTH

truncate EXPR,LENGTH

Truncates the file opened on FILEHANDLE, or named by EXPR, to the specified length. Produces a fatal error if truncate isn't implemented on your system. Returns TRUE if successful, the undefined value otherwise.