Nardol

You probably know this one, but I’ll share for others who might not:

bash$ ls /var/www/apache2-default/
bash$ touch $!

The $! reuses the last argument of the previous command.

Check out this book, it’s got all the tips you could want:

Bash-Z-Shell-Conquering-Command

yeah i find that ^old^new really useful. another tip:

bash$ aptitude -s install zsh
bash$ ^-s

the last line will remove the -s option and thus install zsh

OLD TIP IS OLD!!

Some comments I put at our Developers’ Weblog

Of course, mksh(1) can do it as well:

tg@bleu:~ $ head -2 /var/run/dmesg.boot
MirBSD#10uA4 (GENERIC) #1161: Fri Dec 26 21:05:59 UTC 2008
        tg@bleu.mirbsd.org:/usr/src/distrib/generic/obj/build/GENERIC
tg@bleu:~ $ r 2=3
head -3 /var/run/dmesg.boot
MirBSD#10uA4 (GENERIC) #1161: Fri Dec 26 21:05:59 UTC 2008
        tg@bleu.mirbsd.org:/usr/src/distrib/generic/obj/build/GENERIC
cpu0: Intel(R) Pentium(R) M processor 1.40GHz ("GenuineIntel" 686-class) 598 MHz
tg@bleu:~ $ fc -l
1       head -2 /var/run/dmesg.boot
2       head -3 /var/run/dmesg.boot

What’s best, the modified commands are written into the history, not the modificator itself.

Some of the commentaries are rather clueless too, not $! but $_ is the last word of the last command, in this case:

tg@bleu:~ $ head -2 /var/run/dmesg.boot                                                                         
MirBSD#10uA4 (GENERIC) #1161: Fri Dec 26 21:05:59 UTC 2008
        tg@bleu.mirbsd.org:/usr/src/distrib/generic/obj/build/GENERIC
tg@bleu:~ $ print $_ 
/var/run/dmesg.boot

Instead of “^-s” you would use “r -- -s=” (the two dashes are needed as the “r” built-in alias parses its arguments).

http://samrowe.com/wordpress/advancing-in-the-bash-shell/ has that and more.

See this: http://successtheory.com/tips/zshtips.html