SQ(1) UNIX System V (LOCAL) 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/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).
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