when I try to use --help option with echo command, it does not print help contents, but prints "--help".


prateek@prateek-pc:~/Documents/awk$ echo --help
--help


Version and OS:

Linux prateek-pc 3.13.0-32-generic #57-Ubuntu SMP Tue Jul 15 03:51:08 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux