Ralph Clark wrote:
> Honestly! You perl fanatics would write a perl script to do
> anything. There is no need for this really, it can be done with
> standard unix commands. Just pick one of the following:
>
> To print out all the matching lines themselves:
>
> 1) find <top-directory-name> -type f -exec grep '<string>' {} \;
>
> To print out the names of all the files which contained a matching string:
>
> 2) find <top-directory-name> -type f -exec grep -q '<string>' {} \; -print
> or
> 3) find <top-directory-name> -type f -exec grep -l '<string>' {} \;
>
> To print out both (with the file's name appearing _after_ each list
> of matching strings)
>
> 4) find <top-directory-name> -type f -exec grep '<string>' {} \; -print
>
> I do this all the time. It might be interesting to compare memory
> usage, CPU utilisation and execution time of these methods vs. the
> above perl script.
OK. First of all: find -f sees ELF binaries, .dvi- files etcetera,
which you don't want to scan with grep-like programs. They can mess up
your screen.
Then:
1) does not show filenames at all,
2) and 3) work fine (except for the binaries) if you just want the filenames
4) shows the filenames at the end, which is not what you want because
the output if difficult to parse. Even worse: you get the name on a
separate line, and only after the last matching line.
Finally: speed and memory usage:
Your command 4): elap 1.104 user 0.600 syst 0.500 CPU 99.65
My script: elap 0.296 user 0.260 syst 0.030 CPU 97.82
Yes, you are slower, because you start a process for every file you
find. Which is also why you use more memory.
Its your turn!! I hope you'll also become a Perl fanatic, sometime.
--
Hartelijke groet, Wybo Dekker
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