Section (1) look
look — display lines beginning with a given string
look [options] string
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
look is invoked
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.
Specify a string termination character, i.e. only the characters in
stringup 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.
Path to a dictionary file. The environment variable has greater priority than the dictionary path defined in FILES segment.
The look command is part of the util-linux package and is available from https://www.kernel.org/pub/linux/utils/util-linux/.
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(#)look.1 8.1 (Berkeley) 6/14/93