look — display lines beginning with a given string
look [−dfa] [ −t termchar ] string [file]
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).
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.
Options:
−dDictionary character set and order, i.e. only alphanumeric characters are compared.
−fIgnore the case of alphabetic characters.
−aUse the alternate dictionary /usr/share/dict/web2
−tSpecify 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.
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.
Look appeared in Version 7 AT&T Unix.
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Copyright (c) 1990, 1993 The Regents of the University of California. All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. 3. All advertising materials mentioning features or use of this software must display the following acknowledgement: This product includes software developed by the University of California, Berkeley and its contributors. 4. Neither the name of the University nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. (#)look.1 8.1 (Berkeley) 6/14/93 |