- Look for lines which begins with the given prefix:look prefix file- Look for lines ignoring case:look -f prefix file
[-bdf ] [-t termchar ] string [file ... ]
The utility displays any lines in file which contain string as a prefix.
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:
The LANG , LC_ALL and LC_CTYPE environment variables affect the execution of the utility. Their effect is described in environ(7).
The 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.
uses a linear search by default instead of a binary search, which is what most other implementations use by default.
A utility appeared in AT&T System v7 .
Lines are not compared according to the current locale's collating order. Input files must be sorted with LC_COLLATE set to `C'