Re: Sed and redirection into the same file

On Friday 29 September 2006 16:08, David wrote:
> On Friday 29 September 2006 15:53, Joshua Bassett wrote:
> > Hi all,
> >
> > I was wondering if anyone could help me with a find/replace command I
> > have been trying to get to work:
> >
> > for x in `grep -lr 'foo' app | grep -v "svn"`; do sed 's/foo/bar/'
> > <${x} >${x}; done
> >
> > I want to replace the word 'foo' with the word 'bar' in all files in
> > the 'app' directory', except for files in directories that contain
> > 'svn' anywhere in the directory name.
> >
> > It all appears to work fine, but the problem is when redirecting the
> > output back into the same file...I end up with empty files! For
> > example, the following works fine:
> >
> > for x in `grep -lr 'foo' app | grep -v "svn"`; do sed 's/foo/bar/'
> > <${x} >${x}.new; done
> >
> > Clearly it's something to do with the <${x} >${x} part. What am I missing
> > here?
> >
> > Thanks in advance,
> >
> > Josh.
>
> You can use perl.. simple.
>
> for i in `grep -L svn *` ; do
>         perl -pi -e 's/search/replace/g' $i
> done
>
> HIH.
>
> David

Replying to my own mail... as I just noticed the directories.

#!/bin/sh
files=`find app -type f \! -name \*svn\* -print`
for i in $files ; do
        perl -pi -e 's/search/replace/g' $i
done

HIH.
David