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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) 						      General Commands Manual							   LOOK(1)

NAME
look - find lines in a sorted list SYNOPSIS
look [ -dfnixtc ] [ string ] [ file ] DESCRIPTION
Look consults a sorted file and prints all lines that begin with string. It uses binary search. The following options are recognized. Options dfnt affect comparisons as in sort(1). -i Interactive. There is no string argument; instead look takes lines from the standard input as strings to be looked up. -x Exact. Print only lines of the file whose key matches string exactly. -d `Directory' order: only letters, digits, tabs and blanks participate in comparisons. -f Fold. Upper case letters compare equal to lower case. -n Numeric comparison with initial string of digits, optional minus sign, and optional decimal point. -t[c] Character c terminates the sort key in the file. By default, tab terminates the key. If c is missing the entire line comprises the key. If no file is specified, /lib/words is assumed, with collating sequence df. FILES
/lib/words SOURCE
/src/cmd/look.c SEE ALSO
sort(1), grep(1) DIAGNOSTICS
The exit status is ``not found'' if no match is found, and ``no dictionary'' if file or the default dictionary cannot be opened. LOOK(1)
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