The look utility displays any lines in file which contain string. As
look performs a binary search, the lines in file must be sorted
(where sort(1) was given the same options -d and/or -f that look is
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.
Use the alternative dictionary file.
Use normal dictionary character set and order, i.e., only
blanks and alphanumeric characters are compared. This is on
by default if no file is specified.
Note that blanks have been added to dictionary character set
for compatibility with sort -d command since version 2.28.
Ignore the case of alphabetic characters. This is on by
default if no file is specified.
-t, --terminate character
Specify a string termination character, i.e., only the
characters in string up to and including the first occurrence
of character are compared.
Display version information and exit.
Display help text and exit.
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.
This page is part of the util-linux (a random collection of Linux
utilities) project. Information about the project can be found at
⟨https://www.kernel.org/pub/linux/utils/util-linux/⟩. If you have a
bug report for this manual page, send it to
firstname.lastname@example.org. This page was obtained from the
project's upstream Git repository
2020-05-27. (At that time, the date of the most recent commit that
was found in the repository was 2020-05-27.) If you discover any
rendering problems in this HTML version of the page, or you believe
there is a better or more up-to-date source for the page, or you have
corrections or improvements to the information in this COLOPHON
(which is not part of the original manual page), send a mail to
util-linux June 2011 LOOK(1)