spell, hashmake, spellin, hashcheck — Report Spelling Errors
/usr/bin/spell [-bilvx][+ local-file][file]... /usr/lib/spell/hashmake /usr/lib/spell/spellin n /usr/lib/spell/hashcheck spelling-list
Use the spell command to check spelling in one or more files. The spell command collects words from the named files and looks them up in a spelling list. Words that neither occur among nor are derivable (by applying certain inflections, prefixes, or suffixes) from words in the spelling list are written to the standard output.
If you specify no file arguments, words to check are collected from the standard input. spell ignores most troff(1), tbl(1), and eqn(1) constructs. Copies of all output words are accumulated in the history ...