Help with grep script

eh270 · 01-25-2008, 12:40 PM

I'm familiar with a handful of linux/unix command line tools, but don't know enough about scripting to do this. I'm trying to put together a shell script that will do the following:

get a list of all files in a particular directory
for each file, run grep -c for two defined patterns (e.g., grep -c foo, grep -c bar)
append the results of each grep to a file with this format for each line (without brackets)

{filename} {grep pattern} {count results}

I suspect i need a 'for each' loop ... this seems like it shoudl be pretty easy to do.

Thanks in advance for your help!

Poetics · 01-25-2008, 01:06 PM

This shouldn't be difficult via shell/bash scripting, but since my background is in perl, I came up with a little ditty to help point you in the right direction (this is untested but the theory should be sound):

Code:

#!/usr/bin/perl
#
@filelist = </path/to/directory/*>;
foreach $file (@filelist) {
   $foo = 0;
   $bar = 0;

   $foo = `grep -c foo $file`;
   $bar = `grep -c bar $file`;

   print "$file -- foo -- $foo\n" if ($foo);
   print "$file -- bar -- $bar\n" if ($bar);
}

The above could be done with perl's built-in grep function, but as I said this was a quick-and-dirty script. The above would output the # of occurrences of each word to STDOUT, where you could redirect it anywhere you'd like.

pixellany · 01-25-2008, 01:20 PM

This sounds like homework......

What text are you using? eg Bash Guide for Beginners (free at http://tldp.org)

Do you want to grep for patterns in the filename or in the contents?
contents:
for i in *; do grep pattern $i; done

filename:
ls|grep pattern
or
ls -R|grep pattern

eh270 · 01-25-2008, 03:29 PM

Quote:

Originally Posted by Poetics

The above could be done with perl's built-in grep function, but as I said this was a quick-and-dirty script. The above would output the # of occurrences of each word to STDOUT, where you could redirect it anywhere you'd like.

this is great, thanks a ton! how would i put it to a file, though, instead of stdout?

pixellany · 01-26-2008, 07:05 AM

Quote:

Originally Posted by eh270

this is great, thanks a ton! how would i put it to a file, though, instead of stdout?

Redirection.....

Any command that writes to the screen can be redirected to a file using "> filename"
eg:
ls > listing creates a file with the output of the ls command