7

I have a directory hierarchy that contains numerous .gz files. I want to be able to recursively grep them for the string "foo". From what I've read online the following should work:

zgrep -R -H "foo" .

However, this never returns any results. If I replace the dot with the name of a file it does work. For example,

zgrep -R -H "foo" myFile.gz

however, obviously, this no longer will be recursive.

I know "foo" is in some of the files because the following command returns many results:

find . -iname "*.gz" | xargs zgrep "output" | less

Does anyone know why my recursive zgrep command is not working. I'm on a RHEL linux box

3

Your almost there. Try this:

zgrep -R -H "foo" *.gz

EDIT: Hmmmm.... intriguing!

According to my zgrep, -R (Recursive) is not an option. Its simply not supported. Id have a check to see what the man page of your zgrep says.

One alternative, which depends on only one level of subdirectories is to do this:

zcat */*.gz | grep <needle>

But I would suggest that your find command is probably better!

  • When I try that I get: zsh: no matches found: *.gz – Nosrettap Dec 10 '13 at 22:14
3

The way I usually do is:

zgrep "foo" $(find -name "*.gz")

If that command returns "Argument list too long", try this way:

for I in $(find -name "*.gz"); do zgrep "foo" $I; done
3

You have to install zutils. This will replace the default and limited zgrep on your system with a recursive-able one.

On debian based systems you run apt-get install zutils then you can zgrep -rH myword . and use most of the other parameters from grep you know and love.

  • Hi down-voter. Would love to know why this is not a good idea. I personally used it and I thought it was great. – nzn Sep 17 '15 at 7:59
  • (+1) Not sure why the down vote. For those interested, there is a nice explanation about the zutils version vs the gzip version of zgrep here: unix.stackexchange.com/questions/187742/… – lepe Nov 20 '15 at 5:44
0

Use sift - it's super-fast.

sift -z foo

-z is for unpacking gzips, it descends into subdirectories by default. Shows filenames also by default (your -H option).

PS. Thanks to your question I discovered this tool today. Just battletested it, apart from the functionality you need, I have a 5x speedup on some production logs when comparing to zgrep.

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