has implementation-dependent behavior. (Rationale: the SUSv2 -z option is supported in neither the SUSv3 nor existing Linux implementations).
The behaviors specified in this section are expected to disappear from a future version of the LSB; applications should only use the non-LSB-deprecated behaviors.
compares according to general numerical value, implies -b.
compares (unknown) < JAN < ... < DEC, imply -b.
stabilizes sort by disabling last resort comparison.
uses DIRECTORY for temporary files, not $TMPDIR or /tmp.
outputs version information and exits.