See The MAN page for the last command

$ man !!

$ man !!:0

This works in bash. The "!!:0" limits the argument to man to be only
the first word of the last command. "!!:1" would be the second, etc.


EX:

a...@arul-desktop:~$ ls | wc
     17      17     153
a...@arul-desktop:~$ man !!:0
man ls

a...@arul-desktop:~$ ls | wc
17      17     153
a...@arul-desktop:~$ man !!:1
man |

a...@arul-desktop:~$ ls | wc
17      17     153
a...@arul-desktop:~$ man !!:2
man wc






-- 
Regards,
Tha.Suresh
My experiences with Linux are here,
http://thasulinux.wordpress.com
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