grep, etc

[Bob Stockler]

On Wed, Aug 18, 2004 at 12:17:32PM -0400, Bob Stockler wrote:
| On Wed, Aug 18, 2004 at 11:07:34AM -0400, Bob Stockler wrote:
| | 
| | I would guess that "mawk" would be faster than "grep" in certain
| | circumstances, especially when searching a large file, because
| | it could be made to exit after reading the lines to be matched.
| 
| Example:
| 
|   [trebor] ~bob: time grep '^factory$' /usr/dict/words
|   factory
| 
|   real    0m0.11s
|   user    0m0.06s
|   sys     0m0.01s
|   [trebor] ~bob: time mawk '/^factory$/{print;exit}' /usr/dict/words
|   factory
| 
|   real    0m0.06s
|   user    0m0.01s
|   sys     0m0.00s

And just to read the entire file searching for a non-existing
line in it:

  [trebor] ~bob/Mail: time grep '^xfactory$' /usr/dict/words

  real    0m0.07s
  user    0m0.04s
  sys     0m0.02s
  [trebor] ~bob/Mail: time mawk '/^xfactory$/' /usr/dict/words

  real    0m0.01s
  user    0m0.00s
  sys     0m0.01s

The file size (and time to determine it) is shown by:

  [trebor] ~bob/Mail: time wc /usr/dict/words
    23739  23739 194186 /usr/dict/words

  real    0m0.02s
  user    0m0.01s
  sys     0m0.01s

Bob (Stockler the timer)

-- 
Bob Stockler - bob at trebor.iglou.com
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