Section: User Commands (1)
Updated: June 2011
look - display lines beginning with a given string
utility displays any lines in
performs a binary search, the lines in
must be sorted (where
was given the same options
is invoked with).
is not specified, the file
is used, only alphanumeric characters are compared and the case of
alphabetic characters is ignored.
- -a, --alternative
Use the alternative dictionary file.
- -d, --alphanum
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
Note that blanks have been added to dictionary character set for
compatibility with sort -d command since version 2.28.
- -f, --ignore-case
Ignore the case of alphabetic characters. This is on by default if no file is
- -t, --terminate character
Specify a string termination character, i.e. only the characters
in string up to and including the first occurrence of character
- -V, --version
Display version information and exit.
- -h, --help
Display help text and exit.
utility exits 0 if one or more lines were found and displayed, 1 if
no lines were found, and >1 if an error occurred.
sort -d /etc/passwd -o /tmp/look.dict
look -t: root:foobar /tmp/look.dict
Path to a dictionary file. The environment variable has greater priority
than the dictionary path defined in FILES segment.
the alternative dictionary
utility appeared in Version 7 AT&T Unix.
The look command is part of the util-linux package and is available from