topic For loop issue in Operating System - Linux

For loop issue

Andres_13 — Fri, 23 Nov 2007 13:05:16 GMT

Hi all

I´m newby in shell scripting and i have not idea about how the for loop works. I need:

touch /tmp/file 1
touch /tmp/file 2
.
.
touch /tmp/file n

Any help wiil be helpfull.

Tks and Rgds!

Re: For loop issue

Christian Tremblay — Fri, 23 Nov 2007 13:10:43 GMT

for i in 1 2 3 4 5
do touch /tmp/file$i
done

Re: For loop issue

Andres_13 — Fri, 23 Nov 2007 13:18:45 GMT

Thanks for your quick response Christian, but i need something more 'automatic' (something that donÂ´t need to type the number of "i" ocurrences, because the number of files that i qill need to create is in the order of thousands).

Apreciate your help!

Re: For loop issue

Peter Nikitka — Fri, 23 Nov 2007 13:26:17 GMT

Hi,

modify the variable base and max to your needs!

typeset -i i=0 max=1000
base=/tmp/file
while [ $((i+=1)) -le max ]
do print $base$i
done | xargs touch

mfG Peter

PS: posix/ksh-Shell!

Re: For loop issue

Andres_13 — Fri, 23 Nov 2007 13:39:24 GMT

Thanks Peter that´s what i´m looking for!!!

Regards!

Re: For loop issue

Dennis Handly — Sat, 24 Nov 2007 01:30:32 GMT

>but i need something more 'automatic' (something that doesn't need to type the number of "i" occurrences ...)

If you want to do something where the files already exist:
for file in $(ls file*); do

If you want to do something where the list of things is in a file:
for file in $(< filelist); do