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语  法:look [-adf][-t<字尾字符串>][字首字符串][字典文件]
参  数:
 -a   使用另一个字典文件web2,该文件也位于/usr/dict目录下。
 -d   只对比英文字母和数字,其余一慨忽略不予比对。
 -f   忽略字符大小写差别。
 -t<字尾字符串>   设置字尾字符串。 


NAME look - display lines beginning with a given string

SYNOPSIS look [-dfa] [-t termchar] string [file]

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 in? voked with).

If file is not specified, the file /usr/share/dict/words is used, only alphanumeric characters are compared and the case of alphabetic charac? ters is ignored.


-d Dictionary character set and order, i.e. only alphanumeric char? acters are compared.

-f Ignore the case of alphabetic characters.

-a Use the alternate dictionary /usr/share/dict/web2

-t Specify 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.

FILES /usr/share/dict/words the dictionary /usr/share/dict/web2 the alternate dictionary

SEE ALSO grep(1), sort(1)

COMPATIBILITY The original manual page stated that tabs and blank characters partici? pated in comparisons when the -d option was specified. This was incor? rect and the current man page matches the historic implementation.

HISTORY Look appeared in Version 7 AT&T Unix.