LOOK
Section: User Commands (1)
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BSD mandoc
NAME
look
- display lines beginning with a given string
SYNOPSIS
[-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
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- ENVIRONMENT
-
- FILES
-
- EXIT STATUS
-
- COMPATIBILITY
-
- SEE ALSO
-
- HISTORY
-
- BUGS
-
This document was created by
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Time: 08:55:12 GMT, December 16, 2021