starting with zero (contrast with the -k option)\n\
-b ignore leading blanks in sort fields or keys\n\
-c check if given files already sorted, do not sort\n\
- -d consider only [a-zA-Z0-9 ] characters in keys\n\
+ -d consider only blanks and alphanumeric characters in keys\n\
-f fold lower case to upper case characters in keys\n\
-g compare according to general numerical value, imply -b\n\
- -i consider only [\\040-\\0176] characters in keys\n\
+ -i consider only printable characters in keys\n\
-k POS1[,POS2] start a key at POS1, end it *at* POS2\n\
field numbers and character offsets are numbered\n\
starting with one (contrast with zero-based +POS form)\n\