Look
consults a sorted
file
and prints all lines that begin with
string.
It uses binary search.
The following options are recognised:
- -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.
- -r endkey
- Limit the range of matching values, to include
the word
endkey
but no larger values.
- -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.