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Introduction to Linux - A Hands on Guide
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%s = search hole file
/ = start of the search string
^ = only the stuff on the begin of the line ( $ = for end of line stuff)
\( \) = get in the a buffer
\a = get only aphanumeric characters
/ = end of the search start op the substitution
[ = [
\u = put next char to uppercase
\1 = get the buffer (make it uppercase because of previous line)
\ = escape the meaning of the next character
| = |
\1 = get the buffer again
] = ]
/ = end of the substitution
@ shynijinil: Please don't hijack this thread. Start a new one for your qn.
Also, check your firewall, is telnet server running (shouldn't be).
Also add your distro to your profile so we know what you've got.