```ycsunil wrote:
> C:\Documents and Settings\sunilc\Desktop>ruby test.rb 'add'
> input something
> test.rb:3:in `gets': No such file or directory - add (Errno::ENOENT)
> from test.rb:3
>
> Please let me know why is this error coming?

Kernel#gets tries to read from the file specified by the command line
arguments if there are any. This is documented (and in some cases useful).
If you don't want this behaviour use IO#gets directly (as in: STDIN.gets).

HTH,
Sebastian
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```