what is getopt() ?

[onkar]

A small example please .....

 

[Ian Collins]

A small example please .....

Read your man pages (if you have then), or google "getopt example",
there's plenty of hits to follow.

 

[Ron Natalie]

A small example please .....

getopt() is a not part of the standard C or C++ libraries
and is off-topic here. It is a common UNIX function to
retrieve command line arguments and part of the POSIX
standard I believe. You'll have to look it up on whatever
machine you are working with.