How little you know, and some useful commands.

My favorite bash trick is still Ctrl-O: submit command and advance history by one.<p>If you ever find yourself counting up-arrows to repeat a sequence of commands (that aren't worth scripting for whatever reason), next time, go to the top of the list and hit Ctrl-O. The result is the the command runs, and the one after it in the history is loaded into you prompt.

Watching Star Wars via telnet... I've been looking for that command for ages.

Within the past year I discovered dig's +short parameter, which let me retire some scripts I had for parsing just the IPs out of dig's output. e.g.:<p>dig +short google.com

The "@" command is pretty useful too, for doing arithmetic on shell variables.<p><pre><code> % set i = 1 % echo $i 1 % @ i++ % echo $i 2 % @ i *= 2 % echo $i 4</code></pre>

Bad example:<p><pre><code> $ ls -l 500.* $ ^500^600 </code></pre> Fewer keystrokes (using bash):<p><pre><code> $ ls -l 500.* Up-arrow, control-left, delete, 6</code></pre>

Ctrl-X E didn't work for me. Anyone know what shell that's for? (I'm using bash.)

Ctrl+r instead of history | grep