look
uses binary search to find lines beginning with a given prefix in a sorted file
TLDR
Find lines starting with prefix
$ look [prefix] [path/to/file]
Search case-insensitive alphanumeric only$ look -f -d [prefix] [path/to/file]
Specify termination character$ look -t [char] [prefix] [path/to/file]
Search in dictionary$ look [prefix]
Search in alternative dictionary$ look -a [prefix]
SYNOPSIS
look [options] prefix [file]
DESCRIPTION
look uses binary search to find lines beginning with a given prefix in a sorted file. Without a file argument, it searches the system dictionary (/usr/share/dict/words).
PARAMETERS
-f, --ignore-case
Case-insensitive search-d, --alphanum
Only compare alphanumeric characters-t, --terminate CHAR
Specify string termination character-a, --alternative
Use alternative dictionary (web2)
CAVEATS
Requires input file to be sorted. Uses binary search for efficient lookups. Default behavior searches dictionary when no file specified.