grep: a pedestrian, very fast grep utility

a unix-like, very fast grep utility to find strings(s) in files of any type

Description

a fast grep utility, which finds string pattern(s) in all or selected files of any type in a folder and its subfolders (if the recursion flag -r is set).

file access and string matching are optimized by low-level i/o and string routines.
the recursion algorithm (-r) does not use ML's genpath.

the syntax and options as well as the output closely follow its unix/linux sibling.
string patterns may be defined as regular expressions.

many options allow to fine tune the GREP engine including an extensive set of inclusion/exclusion flags for folders, files, and full paths, which implement a regular expression based wildcard search.

clicking on an underlined text item will open the file at the matching line.

several help levels are implemented

1) quick overview
> grep
> help grep
sparse information about syntax and option flags (see screenshot)

2) extended help
> grep -p
syntax/peculiarities of pattern/file arguments
> grep -e
several examples (see also grepdemo.m)
> grep -f
for programmers: explanation of the second output argument

see the accompanying published M file for instructions and a few typical examples.

• MATLAB release: MATLAB 7.1.0 (R14SP3)
• Other requirements: good spirits

[John D'Errico]

It took me a little while to figure out why this function would not work for me. It needs not just release 14 of matlab, but the most current sub-release, due to its reliance on the newest abilities of cellfun. This should be explicitly documented. As for the documentation, I think its a bit confusing to read. At the least, I'd like to see a few additional examples of use.

[John D'Errico]

Its a bit better now, with the correct release info and better examples. I still can't seriously review it since I can't run it. (I have learned to trust us, so I'll bet it does work.)

[John D'Errico]

A splendid example of a help document! This is the kind of html help that we should all learn to emulate. Good examples that the user can read, fully explaining what the arguments do in each example.

[Malcolm Wood]

Very nice tool! Fast and flexible. A suggestion for possible enhancement:
When displaying results in the MATLAB Command Window, create hyperlinks to the relevant lines using, e.g.
disp('<a href="matlab:opentoline(''myfile.m'',99)">myfile.m:99</a>');

[Kevin Hung]

Very fast and very useful. Have a lot of features (eg. exclude directories). I have no problem running the code.

Also very quick response from the author to implement new features.

[Alex Chung]

Hi,

Can you tell me how to make it work given the following error message? Thanks.

Alex

>> grepdemo

us
Version
                n=-n;
par.class=t.class;
        if par.opt.c

??? Too many inputs.

Error in ==> <a href="error:/shome/xzhang/Matlab2/grep.m,328,1">grep>set_opt at 328</a>
                ic=cellfun(@(x) [pat,class(x),']'],arg,'uniformoutput',false);

Error in ==> <a href="error:/shome/xzhang/Matlab2/grep.m,109,1">grep at 109</a>
                [p,msg]=set_opt(otbl,p,varargin{:});

Error in ==> <a href="error:/shome/xzhang/Matlab2/grepdemo.m,23,1">grepdemo at 23</a>
        grep -i -n Version grep.m

[Jay Dermody]

great function. Very useful. Very Fast. Awesome.

[Abel Brown]

brilliant!!! works right off the bat ... and well. I dont get too many scripts from here that i dont have to mess with before they work on my intel mac. This is perfect! A+ documentation! Now i can finally get rid of my system calls awwwww yeah

[Yair Altman]

An excellent utility that I have come to rely-on in my daily work over the past few years. As with all the other submissions by Urs, GREP is deceivingly simple, extremely powerful and lightningly fast. If possible, I would suggest to make this utility more unix-compliant in its input flags (and yes, I am aware there are different grep flavors depending on the 'nix version). For example, support of -#/-a/-b etc. would be appreciated. Still, this would only be the icing on the cake since as I said GREP is already extremely powerful as-is.

[almog shalom]