=over

=item syswrite FILEHANDLE,SCALAR,LENGTH,OFFSET

=item syswrite FILEHANDLE,SCALAR,LENGTH

=item syswrite FILEHANDLE,SCALAR

Attempts to write LENGTH bytes of data from variable SCALAR to the
specified FILEHANDLE, using the system call write(2).  If LENGTH is
not specified, writes whole SCALAR. It bypasses
stdio, so mixing this with reads (other than C<sysread())>, C<print()>,
C<write()>, C<seek()>, C<tell()>, or C<eof()> may cause confusion
because stdio usually buffers data.  Returns the number of bytes
actually written, or C<undef> if there was an error.  If the LENGTH is
greater than the available data in the SCALAR after the OFFSET, only as
much data as is available will be written.

An OFFSET may be specified to write the data from some part of the
string other than the beginning.  A negative OFFSET specifies writing
that many bytes counting backwards from the end of the string.  In the
case the SCALAR is empty you can use OFFSET but only zero offset.

=back