| LOOK(1) | LOOK(1)
| NAME
| look – find lines in a sorted list
SYNOPSIS
| `look` [ `−dfnixt` c ] [ string ] [ file ]
DESCRIPTION
| Look consults a sorted file and prints all lines that begin with string. It uses binary search.
The following options are recognized. Options `dfnt` affect comparisons as in sort(1). `−i` Interactive. There is no string argument; instead look takes lines from the standard input as strings to be looked up. `−x` Exact. Print only lines of the file whose key matches string exactly. `−d` ‘Directory’ order: only letters, digits, tabs and blanks participate in comparisons. `−f` Fold. Upper case letters compare equal to lower case. `−n` Numeric comparison with initial string of digits, optional minus sign, and optional decimal point. `−t`[c] Character c terminates the sort key in the file. By default, tab terminates the key. If c is missing the entire line comprises the key.
If no file is specified, `/lib/words` is assumed, with collating sequence `df`.
FILES
| `/lib/words`
SOURCE
| `/usr/local/plan9/src/cmd/look.c`
SEE ALSO
| sort(1), grep(1)
DIAGNOSTICS
| The exit status is “`not found`” if no match is found, and “`no dictionary`” if file or the default dictionary cannot be opened.