Document on '!!'

I am using Solaris 2.6

'!!'  is a command to repeat last used command

but sometimes it does not work.

where can I find the document about it .

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!! only works in the c-shell, so it would not work for e.g. root who uses the bourne shell. Check what shell is used in /etc/passwd.

Try man csh for more info!
!! is only available in the (t)csh shell.
Info is available in the man pages on csh.
(  man csh  )
(Look for shell history section)

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Is there an echo in here?
sorry, it took me a while between writing and posting.
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