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Re: grep question

  • Subject: Re: grep question
  • From: The Ghost In The Machine <ewill@xxxxxxxxxxxxxxxxxxxxxxx>
  • Date: Wed, 03 May 2006 19:01:39 GMT
  • Newsgroups: comp.os.linux.advocacy
  • Organization: EarthLink Inc. -- http://www.EarthLink.net
  • References: <RaOdnXGrcoy5Q8rZnZ2dnUVZ_vidnZ2d@speakeasy.net> <618li3-e0o.ln1@sirius.tg00suus7038.net> <reply_in_group-CD361E.20043702052006@news.west.earthlink.net> <1436587.Q3l6MkZcx3@schestowitz.com>
  • User-agent: slrn/ (Linux)
  • Xref: news.mcc.ac.uk comp.os.linux.advocacy:1106049
In comp.os.linux.advocacy, Roy Schestowitz
on Wed, 03 May 2006 11:29:59 +0100
> __/ [ Tim Smith ] on Wednesday 03 May 2006 04:04 \__
>> In article <618li3-e0o.ln1@xxxxxxxxxxxxxxxxxxxxxxx>,
>>  The Ghost In The Machine <ewill@xxxxxxxxxxxxxxxxxxxxxxx> wrote:
>>> > Can grep return just the word that matches the pattern, or can it only
>>> > return the whole line?
>>> >
>> ...
>>> For details on any of these, 'man grep', 'man sed', or
>>> 'man bash' (as bash handles the redirects).
>> One thing to keep in mind, though.  If you need to do anything that you
>> can't very quickly see how to do in grep or sed or whatever, then it
>> often will be faster to write a little Perl script, rather than dig
>> through the zillion options of grep, etc., trying to find the
>> combination that does what you want.
> Au comtraire. In defence of grep, its basic use is simple enough to appeal to
> command-line newbies:
> grep file 'search phrase' (or regular expression, if you must)
> This is quicker to do than opening a file, opening search prompt/widget, then
> entering phrase. Also, grep is less computationally hungry.
> Then come to consider extensibility, recursion, batch mode (including
> scriptability), and multi-file operations. When someone sought the code of
> an error message in WordPress, for example, I immediately ran:
> grep -r * 'error message substring'
> to find the line in a file within a subdirectory.
> That's not too complex, yet the level of expressiveness is high.
> Best wishes,
> Roy

Yes, grep and sed do the simple stuff well enough; perl is for the more
complicated items. :-)

At least, that's my take, more or less.

#191, ewill3@xxxxxxxxxxxxx
Windows Vista.  Because it's time to refresh your hardware.  Trust us.

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