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Re: pretty easy thing but too hard for me! (random array element)
- X-seq: zsh-users 11697
- From: "Brian K. White" <brian@xxxxxxxxx>
- To: <zsh-users@xxxxxxxxxx>
- Subject: Re: pretty easy thing but too hard for me! (random array element)
- Date: Thu, 2 Aug 2007 00:10:55 -0400
- Mailing-list: contact zsh-users-help@xxxxxxxxxx; run by ezmlm
- Organization: Aljex Software
- References: <fb3648c60708011423x64c03105i8a4a63b9ba2f55e3@xxxxxxxxxxxxxx>
----- Original Message -----
From: "fREW" <frioux@xxxxxxxxx>
To: "Zsh users list" <zsh-users@xxxxxxxxxx>
Sent: Wednesday, August 01, 2007 5:23 PM
Subject: pretty easy thing but too hard for me! (random array element)
Hello zsh amigos!
I want to make a tiny fuction that will
#1 get a list of files
#2 choose a random file
#3 open the random file
I was going to just do something like
arr=( * )
feh $arr[(some random number or something)]
but I don't know how to do the random number part and there may be a
better way anyway. Thoughts? Ideas? Wisdom?
Q: Why is this email 5 sentences or less?
I have a random splash thing where as part of my companies software the
start script flashes an ascii splash logo for a half-second on start-up. I
got bored one day, found a ascii art font generator thing on line that let
me plug in our name and get large ascii art renditions of it in about 30
I did something cruder even than loading up an array. It requires the files
have consecutive numerical filenames and just applies $RANDOM and a little
But it works in bash/ksh/zsh and doesn't require zsh or a zsh module
I wouldn't be surprised if both uses of backticks are avoidable somehow.
Since even my SCO boxes all have zsh by now redoing this with the randline
thing has appeal.
# Select a splash at random and display it.
# requires bash/ksh/zsh
# 20060411 brian@xxxxxxxxx
# put as many splash files as you want in /u/aljex/splash
# use only 3-digit, zero padded, numerical, consecutive filenames
# starting with 000
cd $SplashDir || exit 1
typeset -i SplashQty=`echo * |wc -w`
typeset -i RandomDivider=$((32767/$SplashQty))
RandomSelection=`printf "%03d" $((RANDOM/$RandomDivider))`
# The math is slightly off
# .1% of the time RandomSelection == SplashQty, which is 1 too high.
# Never comes out below 0 but what the heck, might as well catch that too.
[ $RandomSelection -lt 000 ] && RandomSelection=000
[ $RandomSelection -ge $SplashQty ] && RandomSelection=$((SplashQty-1))
Brian K. White brian@xxxxxxxxx http://www.myspace.com/KEYofR
filePro BBx Linux SCO FreeBSD #callahans Satriani Filk!
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