|| FreeBSD General Commands Manual
display lines beginning with a given string
|| [ -df][ -t termchar] string [ file ...]
utility displays any lines in
as a prefix. As
performs a binary search, the lines in
must be sorted.
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:
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.
environment variables affect the execution of the
utility. Their effect is described in
EXIT STATUS 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.
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.
look utility 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_COLLATE set to ‘