topic Need script help in Operating System - HP-UX

Need script help

Roy Schauwecker — Fri, 07 Mar 2003 17:42:21 GMT

I know what I want to do but not sure how to make it happen. Trying to write a script that will identify bad links. I'm sure there is some simple solution. Yes, quite a novice in this realm. This is actually my first post.

Step 1)
find /fntst2 -type l -exec ll -d {} \; >/tmplnk
(this locates my link and puts them out to a temporary file)

Step 2) I want to search this file and print out all of the lines that DO NOT match my search criteria...the bad links. How do I search this temporary file for multiple strings? i.e. - vgx001, vgx002, vgx003 and then print out the lines that do not match.

I know I could do a grep -v vgx001 file but that would pull up my valid links as well. Any help is greatly appreciated.

Re: Need script help

John Palmer — Fri, 07 Mar 2003 17:53:08 GMT

If you're looking for specific names then you could use grep...

find /fntst2 -type l -exec ll -d {} \; | grep -e name1 -e name2 -e name3

Or you could use file instead of ll to identify links that point nowhere...

find /fntst -type l -exec file {} \; | grep "cannot open"

Regards,
John

Re: Need script help

Pete Randall — Fri, 07 Mar 2003 17:55:13 GMT

Hi,

grep -vE 'vgx001|vgx002|vgx003' file

should print out the non-matching lines for you.

Pete

Re: Need script help

Roy Schauwecker — Fri, 07 Mar 2003 18:01:53 GMT

Thanks. I'll use your idea of searching for the links that point to nothing. I'm actually interested in identifying links that are pointing to the wrong location...a volume group that they should not be pointing to. We have had some issues with this lately. What I want to do is plug in the valid volume groups and any line that doesn't match my list would be printed out to the teminal.

Re: Need script help

Pete Randall — Fri, 07 Mar 2003 18:03:57 GMT

Roy,

Really!! Try the grep -v!!! That's exactly what it does!!!! Print out the non-matches!!!!!

Trust me!

Pete

Re: Need script help

Roy Schauwecker — Fri, 07 Mar 2003 18:13:40 GMT

Excuse my ignorance. The grep -e will actually exclude the lines that contain the search strings and print out the lines that are not a match?

Re: Need script help

Pete Randall — Fri, 07 Mar 2003 18:17:20 GMT

No, it's the grep -v that prints the non-matching lines, the E just allows the extended regular expression syntax. It's like what John was doing with multiple -e operands.

But it's -v you want - that will print the non match. From man grep:

" -v All lines but those matching are printed."

Pete

Re: Need script help

Roy Schauwecker — Fri, 07 Mar 2003 18:47:08 GMT

Thanks to John and Pete you have both been a great help. I'm new to this site and these forums. What a great source of information.

Im using John's suggestion to locate bad links and Pete's suggestion to locate improperly allocated links.

Re: Need script help

Michael Steele_2 — Sat, 08 Mar 2003 01:56:57 GMT

find /fmtst2 -type -l -print | perl -nle '-e || print' | while read a
do
rm $a
done

(* Can't test right now. :-( *)

Re: Need script help

Michael Steele_2 — Sat, 08 Mar 2003 02:00:59 GMT

Note: This will remove bad symbollic links: (* I believe *)

find /fmtst2 -type -l -print | perl -nle '-e || print' | while read a
do
rm $a
done

Note: This will just find them. (* TESTED *)

find /fmtst2 -type -l -print | perl -nle '-e || print' > /tmp/file

Re: Need script help

Jordan Bean — Sun, 09 Mar 2003 23:38:43 GMT

#!/usr/bin/sh
# search and destroy broken
# symlinks in current dir.
find . -type l -xdev | while read link junk
do
[ -e "$link" ] || rm $link
done

Re: Need script help

Jordan Bean — Mon, 10 Mar 2003 20:23:04 GMT

Probably more efficient to do this if you have hundreds of links to remove.

#!/usr/bin/sh
# search and destroy broken
# symlinks in current dir.
find . -type l -xdev | while read link
do
[ -e "$link" ] || echo \"$link\"
done | xargs rm

The quotes should account for any whitespaces in the file names.