Minimum unique abbreviation of option is acceptable. You may use double hyphens instead of single hyphen to denote options. You may use white space in place of the equals sign to separate an option name from its value.
This program is part of Netpbm.
pnmcut was obsoleted by pamcut, introduced with Netpbm 9.20 (May 2001). pamcut is backward compatible with pnmcut, plus adds many additional functions, including the ability to process PAM images.
pnmcut remains in the Netpbm package because it probably has fewer bugs for now than pamcut. Some day, pnmcut will probably become an alias for pamcut.
You can use the pamcut documentation for pnmcut, as long as you avoid any function which it says was added after Netpbm 9.20.