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Best bash tip ever! Use mksh!

31.12.2008 by tg@
Tags: mksh

Best Bash tip ever! is a little… interesting. 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).


More on Planet Debian (read via Planet Symlink): how many times do I have to tell you it’s “CAs” not “CA’s” again? Please do the world a favour and read Apostrophen und andere Katastrophen with rules for German and English: never in German except the word ends with s or similar: „Jens’, Max’ und Joes CDs“ and for genitives only in both languages, but with apostrophe in English: “Jens’, Max’ and Joe’s CDs”

ciruZ now has a blog too… with two ruby scripts. I prefer mine in mksh very much, thank you :þ

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