|LOOK(1)||General Commands Manual||LOOK(1)|
lookutility displays any lines in file which contain string as a prefix.
If file is not specified, the file /usr/share/dict/words is used, only alphanumeric characters are compared and the case of alphabetic characters is ignored.
The following options are available:
- Use a binary search on the given word list. If you are ignoring case with
-for ignoring non-alphanumeric characters with
-d, the file must be sorted in the same way. Please note that these options are the default if no filename is given. See sort(1) for more information on sorting files.
- Dictionary character set and order, i.e., only alphanumeric characters are compared.
- Ignore the case of alphabetic characters.
- Specify a string termination character, i.e., only the characters in string up to and including the first occurrence of termchar are compared.
LC_CTYPEenvironment variables affect the execution of the
lookutility. Their effect is described in environ(7).
- the dictionary
lookutility exits 0 if one or more lines were found and displayed, 1 if no lines were found, and >1 if an error occurred.
COMPATIBILITY¶The original manual page stated that tabs and blank characters participated in comparisons when the
-doption was specified. This was incorrect and the current man page matches the historic implementation.
look uses a linear search by default
instead of a binary search, which is what most other implementations use by
--alternative flags are ignored for
SEE ALSO¶grep(1), sort(1)
lookutility appeared in Version 7 AT&T UNIX.
BUGS¶Lines are not compared according to the current locale's collating order. Input files must be sorted with
LC_COLLATEset to ‘
|July 17, 2004||Linux 4.19.0-10-amd64|