A snippet from the ps manpage...

ps-man-page.txt

ENVIRONMENT VARIABLES
       The following environment variables could affect ps:

       COLUMNS
          Override default display width.

       LINES
          Override default display height.

       PS_PERSONALITY
          Set to one of posix, old, linux, bsd, sun, digital...  (see section PERSONALITY below).

       CMD_ENV
          Set to one of posix, old, linux, bsd, sun, digital...  (see section PERSONALITY below).

       I_WANT_A_BROKEN_PS
          Force obsolete command line interpretation.