Why is cut slower than awk? Post: 302284635

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Top Forums UNIX for Advanced & Expert Users Why is cut slower than awk? Post 302284635 by angheloko on Friday 6th of February 2009 01:55:57 AM

02-06-2009

Registered User

Out of curiosity, I also tried some testing myself. On a file with 250 lines there's no difference.

But on a file with 1000 lines, cut was faster by 1 sec.

On a file with 10000 lines, the result is the same:

Code:

FILE
450000 Feb  6 14:32 test.file

CONTENTS
the quick brown fox jumped over the lazy dog
the quick brown fox jumped over the lazy dog
the quick brown fox jumped over the lazy dog
the quick brown fox jumped over the lazy dog
the quick brown fox jumped over the lazy dog
the quick brown fox jumped over the lazy dog
the quick brown fox jumped over the lazy dog
the quick brown fox jumped over the lazy dog
the quick brown fox jumped over the lazy dog
the quick brown fox jumped over the lazy dog
...
...

USING AWK
real    0m0.07s
user    0m0.05s
sys     0m0.10s

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

I'm using HP-UX. Maybe awk is better for files far larger than 10000 lines while cut is better for smaller files. Or maybe because of their differences in primary use. I'm not sure about this though. Need to do some more tests.

Last edited by angheloko; 02-06-2009 at 03:03 AM..

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hash_update_stream

HASH_UPDATE_STREAM(3)							 1						     HASH_UPDATE_STREAM(3)

hash_update_stream - Pump data into an active hashing context from an open stream

SYNOPSIS

       int hash_update_stream (resource  $context, resource  $handle, [int  $length = -1])

DESCRIPTION

PARAMETERS

	      o $context
		- Hashing context returned by hash_init(3).

	      o $handle
		- Open file handle as returned by any stream creation function.

	      o $length
		- Maximum number of characters to copy from $handle into the hashing context.

RETURN VALUES

	Actual number of bytes added to the hashing context from $handle.

EXAMPLES

       Example #1

	      hash_update_stream(3) example

	      <?php
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	      fwrite($fp, 'The quick brown fox jumped over the lazy dog.');
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	      $ctx = hash_init('md5');
	      hash_update_stream($ctx, $fp);
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	      The above example will output:

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SEE ALSO

       hash_init(3), hash_update(3), hash_final(3), hash(3), hash_file(3).

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