Re: Using the grep command to filter
- From: Barry Margolin <barmar@xxxxxxxxxxxx>
- Date: Sun, 29 Oct 2006 01:02:20 -0400
In article <84iri4dtde.fsf@xxxxxxxxx>, comphelp@xxxxxxxxx (Todd H.)
wrote:
transmute70@xxxxxxxxx writes:
Hello Everyone,
I am a college student currently enrolled in a Unix class. Unix is in
no way shape or form related to my major, and needless to say, I'm
stumped.
Finally someone asking for help with a homework question coming clean
and saying it's a homework question. Now this is the student I'd like
to help learn the material.
The question I must answer is this:
"Enter a single command-line that would find out the 5 files in/under
/etc that contain the string 'ubuntu,' case insensitively, more than
any other file in/under the /etc directory. Sort the list from most to
least and throw away standard error."
Okay, so let's break this down. We need to find all files in /etc/
that ubuntu Ubuntu UBUNTU ubunTU whatever in them. Grep is the tool
for the job. grep ubuntu /etc/* of course. But that will do a case
senstive search. I'll bid you to consult
$ man grep
to find the one option you need to add to the grep command to make the
search case insensitive.
Now look at the output of that grep command will give you all the
lines of text in all the files in /etc with ubuntu in em. You may
even notice filenames at the beginning of each matching line.
Hrmm... maybe we can't just to a grep and maybe we need to start with
another command to operate on each file one at a time.
You could also use the option to grep that tells it to just print the
count of matches, rather than the matching lines themselves.
Big Hint: your one big ole command might start with a find /etc -exec
command and in the -exec clause, think about grep, wc, then maybe
piping that output somehow into sort finishing off with head -5
might be the ticket.
If you use the option to print the count of matches, you don't need to
use wc at all.
I can do each part the question asks separately, but I've no idea how
to put this all together to create a single working command. Any help
would be greatly appreciated.
I think the "one file at a time" operation that find /etc -exec
brings to the table might be the concept you're looking for.
Not if you use the -c option to grep.
Another approach might involve a shell for loop.
Work on it a while and come back with follow on questions.
Best Regards,
--
Barry Margolin, barmar@xxxxxxxxxxxx
Arlington, MA
*** PLEASE post questions in newsgroups, not directly to me ***
*** PLEASE don't copy me on replies, I'll read them in the group ***
.
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