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CentOS 7.0 - man page for look (centos section 1)

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LOOK(1) 				  User Commands 				  LOOK(1)

       look - display lines beginning with a given string

       look [options] string [file]

       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) got  the	same  options  -d
       and/or -f that look is invoked with).

       If  file is not specified, the file /usr/share/dict/words is used, only alphanumeric char-
       acters 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  alphanumeric  characters
	      are compared.  (This is on by default if no file is specified.)

       -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 are compared.

       -h, --help
	      Display help text and exit.

       -V, --version
	      Output version information 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.

	      sort -d /etc/passwd -o /tmp/look.dict
	      look -t: root:foobar /tmp/look.dict

	   the dictionary

	   the alternative dictionary

       grep(1), sort(1)

       The original manual page stated that tabs and blank characters participated in comparisons
       when  the  alphanum  option  was  specified.  This was incorrect, and the current man page
       matches the historic implementation.

       The look utility appeared in Version 7 AT&T Unix.

       The look command is part of the util-linux package and is  available  from  ftp://ftp.ker-

util-linux				    June 2011					  LOOK(1)
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