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Comments for kgrep

24 Nov 2003 12:55 reboot2

Why kgrep?

> Yes, GNU grep is available on most Linux systems, but in my experience, it's often not installed on the proprietary systems I use (which happen to include Perl5 with some regularity). I sometimes find it easier to install a small Perl script than build and install GNU grep on those machines.

If that is the main purpose I would make that the main point in the description. Don't describe what grep does, because probably anyone knows that. Describe why one would want to install kgrep instead of grep, when no grep is available.


When I read the description i thought "grep can do that too, it is in perl, so what, i don't need it". Maybe that is only my opinion, but what I probably should have though is "hey, if i ever need a grep and have perl installed, i can use kgrep".

24 Nov 2003 11:10 pronovic

Re: GNU grep

> GNU grep can do that too with -A and -B
> switches. You should really update the
> description of the tools with some good
> reasons why it is superior to the
> standard grep that is probably available
> on any system.

I admit to missing the -A and -B options in the GNU grep manpage. Yes, these options are equivalent to kgrep's -n option.

Incidentally, I never said that the tool was "superior" to GNU grep or any other grep. I just said "some of this functionality may be duplicated in some versions of grep, but the script is still useful and will work on any machine which has Perl5 installed".

Yes, GNU grep is available on most Linux systems, but in my experience, it's often not installed on the proprietary systems I use (which happen to include Perl5 with some regularity). I sometimes find it easier to install a small Perl script than build and install GNU grep on those machines.

So, there's no need to update the description. It's accurate as it stands. Unless there's something specific in the description that you think is wrong? (I agree that my response to the -C question was incorrect.)

24 Nov 2003 10:38 reboot2

Re: GNU grep

> > Doesn't GNU grep do this with -C ?
%
> Roughly, but not quite. You can't ask GNU grep to give you a different number of lines of context above and below a given match. So, 'grep -C 2' (to get two lines of context above and below) is equivalent to 'kgrep -n 2' or 'kgrep -n 2,2', but kgrep also allows 'kgrep -n 1,2' or 'kgrep -n 0,5' (to get, respectively, one line above and two below, or no lines above and five below).

GNU grep can do that too with -A and -B switches. You should really update the description of the tools with some good reasons why it is superior to the standard grep that is probably available on any system.

09 Sep 2003 08:29 pronovic

Re: GNU grep

> Doesn't GNU grep do this with -C ?


Roughly, but not quite. You can't ask GNU grep to give you a different number of lines of context above and below a given match. So, 'grep -C 2' (to get two lines of context above and below) is equivalent to 'kgrep -n 2' or 'kgrep -n 2,2', but kgrep also allows 'kgrep -n 1,2' or 'kgrep -n 0,5' (to get, respectively, one line above and two below, or no lines above and five below).

Besides, the description of the project does say, "Some of this functionality may be duplicated in some versions of grep, but the script is still useful and will work on any machine which has Perl5 installed." :-)

09 Sep 2003 01:42 akhill

GNU grep
Doesn't GNU grep do this with -C ?

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