sq(1)
| SQ(1) | General Commands Manual | SQ(1) |
NAME
sq - squeeze a sorted word list unsq - unsqueeze a sorted word list
SYNOPSIS
sq < infile > outfile
unsq < infile > outfile
DESCRIPTION
sq compresses a sorted list of words (a dictionary). For example:
sort /usr/share/dict/words | sq | compress >
words.sq.Z
will compress dict by about a factor of 4.
unsq uncompress the output of sq. For example:
compress -d < words.sq.Z | unsq | sort -f -o
words
will uncompress a dictionary compressed with sq.
The squeezing is achieved by eliminating common prefixes, and replacing them with a single character which encodes the number of characters shared with the preceding word. The prefix size is encoded as a single printable character: 0-9 represent 0-9, A-Z represent 10-35, and a-z represent 36-61.
AUTHOR
Mike Wexler
SEE ALSO
compress(1), sort(1).
| LOCAL |