Re: OT: running a command on many files in many subdirectories

[Travis Crump <pretzalz@techhouse.org>]

Levi Waldron wrote:
> I'm sure this is simple, but maybe someone here can help me do it in a few 
> minutes instead of hours.  I have a bunch of files in a bunch of 
> directories, and I want to run the same command on each of them.  For each 
> input file, the output file should have the same name except ending in .txt, 
> and the output files should be put a common directory.  ie,
>
> java ImageInfo dir1/pic1.jpg > commondir/pic1.txt
>
> etc, repeated over a bunch or directories and jpg files.  The subdirectories 
> only go one deep.  
>
> If this is difficult I could copy all the jpg files into a single 
> directory first with only a little bit of tedium.
>
> Thank you, Levi

for i in `find . -name "*.jpg"`; do java ImageInfo "$i" > `echo $i | sed 
-e 's~^.*/~commondir/~' -e 's/jpg$/txt/'`; done

all on one line.  You probably want to look over 
<http://www.tldp.org/HOWTO/Bash-Prog-Intro-HOWTO.html> and/or 
<http://www.tldp.org/LDP/abs/html/> for guides on how to write simple 
scripts.