 
Subject
Did you know that you can recall the last argument to
the last command you typed by using the special
variable !$. This can be handy when you are working with host names, long file names, all sorts of things. A few examples:
See if a host is up and log in:
usr-3@srv-3 usr-3]$ ping e2500.prod.bigfatdomain.com
(output of ping snipped -- you've seen it before!)
[usr-3@srv-3 usr-3]$ ssh !$
ssh e2500.prod.bigfatdomain.com
[email protected]'s password:
User Names:
[root@srv-3 usr-3]# useradd -u 666 -g 100 udergahad
[root@srv-3 usr-3]# passwd !$
passwd udergahad
Changing password for user udergahad.
New UNIX password:
File Operations:
[root@srv-3 usr-3]# ls -l /var/log/messages
-rw------- 1 root root 5490 Jun 24 09:20 /var/log/messages
[root@srv-3 usr-3]# cp !$ !$.020624
cp /var/log/messages /var/log/messages.020624
[root@srv-3 usr-3]# scp !$ atom:/share/usr-3/
scp /var/log/messages.020624 atom:/share/usr-3/
root@atom's password:
messages.020624 100% |*********************| 5490 00:00
[root@srv-3 usr-3]#
Those are just some dumb examples, but you'll get a lot of bang from your buck with this trick.
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