show os

[MuthuKumar]

hello all,

 I am using gdb of
(gdb) show vers
HP gdb 4.0 for HP Itanium (32 or 64 bit) and target HP-UX 11.2x.
Copyright 1986 - 2001 Free Software Foundation, Inc.
Hewlett-Packard Wildebeest 4.0 (based on GDB) is covered by the
GNU General Public License. Type "show copying" to see the conditions to
change it and/or distribute copies. Type "show warranty" for warranty/support.

If i put the command as show os it is showing only as 
(gdb) show os
Operating system is "".

what is the problem with this.

Regards,
Muthukumar.