xenial (1) unsq.1.gz

NAME

       sq, unsq - squeeze or 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 -u /usr/share/dict/words | sq | gzip -9 > words.sq.gz
       will compress dict by about a factor of 5.

       unsq uncompress the output of sq.  For example:
              gunzip < words.sq.gz | 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.

BUGS

       sq and unsq can only handle words of up to 256 characters.  The input must be sorted, and duplicates must
       be suppressed.

AUTHOR

       Mike Wexler

SEE ALSO

       compress(1), sort(1).

                                                      LOCAL                                                SQ(1)