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Top Forums UNIX for Dummies Questions & Answers Unix "look" Command "File too large" Error Message Post 302516074 by Corona688 on Thursday 21st of April 2011 03:07:49 PM
Old 04-21-2011
Ah, I think I see:
Code:
DESCRIPTION
     The look utility displays any lines in file which contain string as a
     prefix.  As look performs a binary search, the lines in file must be
     sorted (where sort(1) got the same options -d and/or -f that look is
     invoked with).

...so look really does need to know how long the file is.

grep should work since it doesn't, but won't have the performance advantage of being able to do a binary search.
 

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LOOK(1) 						    BSD General Commands Manual 						   LOOK(1)

NAME
look -- display lines beginning with a given string SYNOPSIS
look [-df] [-t termchar] string [file ...] DESCRIPTION
The look utility displays any lines in file which contain string as a prefix. As look performs a binary search, the lines in file must be sorted. If file is not specified, the file /usr/share/dict/words is used, only alphanumeric characters are compared and the case of alphabetic char- acters is ignored. Options: -d Dictionary character set and order, i.e. only alphanumeric characters are compared. -f Ignore the case of alphabetic characters. -t Specify a string termination character, i.e. only the characters in string up to and including the first occurrence of termchar are compared. The look utility exits 0 if one or more lines were found and displayed, 1 if no lines were found, and >1 if an error occurred. FILES
/usr/share/dict/words the dictionary SEE ALSO
grep(1), sort(1) COMPATIBILITY
The original manual page stated that tabs and blank characters participated in comparisons when the -d option was specified. This was incor- rect and the current man page matches the historic implementation. HISTORY
A look utility appeared in Version 7 AT&T UNIX. BSD
June 14, 1993 BSD
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