McEs, A Hacker Life: Twittable scripts

Wednesday, May 21, 2008

Twittable scripts

Fascinated by Nat's Twittable scripts posts a few weeks ago, I thought I give the idea a try.

Here are some easy ones that I mostly converted from C concepts I liked to shell:

echoes: This one echoes itself out. Kind of a fixed point...

q=\';s=';echo "q=\\$q;s=$q$s$q$s"';echo "q=\\$q;s=$q$s$q$s"

pid-randomizer: This is one of my favorites in functionality. Randomizes the process-id space. Useful on shared systems... Based on the same idea as echoes.

q=\';s=';sh -c "q=\\$q;s=$q$s$q$s&"';sh -c "q=\\$q;s=$q$s$q$s&"

Most people recognize the C version better (except for Perl programmers of course):

main(){while(!fork()){}}

filler: This one I spent a couple nights on to make fit. It draws the Hilbert space-filling curve. My version does it very quickly and has very few alphabetic letters in it:

clear;-(){ printf ".\10\33[\10$((19>>($1)%4&7))";};.(){
set .\ $*\ -$2 -\ $*;[ ${4:5} ]||($1$2;$3$4;$1 +$4;$3;$1 +$4;$3-$4;$1-$2)};. 7 +1

Nat prefers the version without clear and with a sleep to slow it down:

l(){ sleep .1;printf ".\e[\10$((19>>($1)%4&7))\b";};.(){
set .\ $*\ -$2 l\ $*;[ ${4:5} ]||($1$2;$3$4;$1 +$4;$3;$1 +$4;$3-$4;$1-$2)};. 7 +1

These work with bash. No idea about other shells. Can someone come up with a version with both the clear and the sleep, in less than 140 bytes?

Labels: justforfun, nat, shell, twitter

¶ 7:53 PM

Comments:

Should you really twitter a fork bomb?

# posted by

Anonymous : May 22, 2008 3:17 AM

nice!
Note Nat's version uses l() which
will conflict with the common alias l

# posted by

Pádraig Brady : May 22, 2008 5:13 AM

karl, that's not a fork bomb.

The classic fork bomb fits into twitter of course:

:(){:|:;};:&

# posted by

behdad : May 22, 2008 8:38 AM

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