Provided by: ispell_3.4.00-6build1_amd64
sq, unsq - squeeze or unsqueeze a sorted word list
sq < infile > outfile unsq < infile > outfile
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.
sq and unsq can only handle words of up to 256 characters. The input must be sorted, and duplicates must be suppressed.