DragonFly On-Line Manual Pages

Search: Section:  

LOOK(1)                DragonFly General Commands Manual               LOOK(1)


look -- display lines beginning with a given string


look [-df] [-t termchar] string [file ...]


The look utility displays any lines in file which contain string as a prefix. As look performs a binary search, the lines in file 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: -d, --alphanum Dictionary character set and order, i.e., only alphanumeric characters are compared. -f, --ignore-case Ignore the case of alphabetic characters. -t, --terminate termchar Specify a string termination character, i.e., only the characters in string up to and including the first occurrence of termchar are compared.


The LANG, LC_ALL and LC_CTYPE environment variables affect the execution of the look utility. Their effect is described in environ(7).


/usr/share/dict/words the dictionary


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.


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. The -a and --alternative flags are ignored for compatibility.


grep(1), sort(1)


A look utility appeared in Version 7 AT&T UNIX.


Lines are not compared according to the current locale's collating order. Input files must be sorted with LC_COLLATE set to `C'. DragonFly 4.3 January 12, 2016 DragonFly 4.3

Search: Section: