On Mon, 24 Feb 2003, Michael Torrie suggested we build a large wooden badger: > On Mon, 2003-02-24 at 16:48, Stuart Jansen wrote: > > On Mon, 2003-02-24 at 12:17, Michael Ryan Byrd wrote: > > > So I decide I want to show all the index.html files on my system with: > > > > > > ls -alR |grep "index.html" > > > > > > (I could have used 'Find . -name "index.html" -print', but anyway.) > > > > > > The problem is that this command is not executed as root, so I'm going to get a > > > bunch of errors like: > > > > Two solutions have already been given. However, I personally think the cleanest is > > > > ls -alR 2>/dev/null | grep "index.html" > > That's the exact same as ls -alR | grep "index.html" 2> /dev/null. > > In either case grep doesn't process standard error. It really doesn't > matter where on the commandline you put the 2> /dev/null. I don't think > it matters where you put 2>&1 either if you really need to parse the > error stream. > > Note that in the case of the original poster he's using csh, which > doesn't have the same syntax for redirection and thus 2> is illegal. > Anyone know how to do it?
In csh, you can redirect stdout with ">", or both stdout and stderr with ">&", but there isn't a great way to redirect just stderr. If you put the command inside parens (), it runs it in a subshell. You can use this to redirect inside the subshell, then throw away everything outside: ( ls -alR | grep "index.html" > /tmp/output ) >& /dev/null This will put the results (stdout) into /tmp/output Of course, if you really wanted to, you could always do something like this to display stdout: mkfifo /tmp/output tail -f /tmp/output & ( ls -alR | grep "index.html" > /tmp/output) >& /dev/null kill %1 rm -f /tmp/output I've managed quite a few useful scripts in tcsh. In some respects, its syntax is more sane than some languages, however it's really not quite as powerful for scripting. Then again, if you're going to do much scripting, you ought to use bash, perl, python, php, <insert_other_scripting_language_here>, or emacs. Frank --------------------------------------------------------------------------- Frank Sorenson - KD7TZK CSR Computer Science Department Brigham Young University [EMAIL PROTECTED] ____________________ BYU Unix Users Group http://uug.byu.edu/ ___________________________________________________________________ List Info: http://phantom.byu.edu/cgi-bin/mailman/listinfo/uug-list
