Hard to tell...

Apparently you didn't

• check the return code
• didn't use seek beforehand
• didn't tell us if an exception occured

From truncate

• truncate FILEHANDLE,LENGTH
• truncate EXPR,LENGTH

Truncates the file opened on FILEHANDLE, or named by EXPR, to the specified length.

Raises an exception if truncate isn't implemented on your system. Returns true if successful, undef on error.

The behavior is undefined if LENGTH is greater than the length of the file.

The position in the file of FILEHANDLE is left unchanged. You may want to call seek before writing to the file.

Portability issues: "truncate" in perlport.

> I tried to write this same code in other languages, and those codes failed too

Probably a problem for Windows XP (!) to handle a Linux FS.

So not really a Perl problem.

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