LOOK
Section: User Commands (1)Index Return to Main Contents
BSD mandoc
NAME
look - display lines beginning with a given stringSYNOPSIS
[-bdf ] [-t termchar ] string [file ... ]DESCRIPTION
The utility 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:
- -b, -binary
- Use a binary search on the given word list. If you are ignoring case with -f or 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.
- -d , -alphanum
- Dictionary character set and order, i.e., only alphanumeric characters are compared.
- -f , -ignore-case
- Ignore the case of alphabetic characters.
- -t , -terminate termchar
- Specify a string termination character, i.e., only the characters in string up to and including the first occurrence of termchar are compared.
ENVIRONMENT
The LANG , LC_ALL and LC_CTYPE environment variables affect the execution of the utility. Their effect is described in environ(7).FILES
- /usr/share/dict/words
- the dictionary
EXIT STATUS
The utility 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 -d option was specified. This was incorrect and the current man page matches the historic implementation.uses a linear search by default instead of a binary search, which is what most other implementations use by default.
The -a and --alternative flags are ignored for compatibility.
SEE ALSO
grep(1), sort(1)HISTORY
A utility appeared in AT&T System v7 .BUGS
Lines are not compared according to the current locale's collating order. Input files must be sorted with LC_COLLATE set to `C'
Index
This document was created by man2html, using the manual pages.
Time: 04:45:19 GMT, September 16, 2022
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