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intro(1)
NAME
  intro - Introduction to commands

DESCRIPTION
  Section 1 describes the commands available for all DIGITAL UNIX users.

  Some reference pages in this section may contain suffixes to allow their
  files to exist with those of other reference pages having the same base
  name and section number. When used, suffixes are made up of one to four
  letters. See the man(1) reference page for more information on suffixes.

  Commands related to system maintenance appear in Section 8.

ERRORS
  On termination, each command returns two bytes of status, one supplied by
  the system giving the cause for termination and, in the case of normal
  termination, one supplied by the program.  For more information, see
  exit(2).  The first byte is 0 for normal termination; the second byte is
  customarily 0 for successful execution.  A nonzero status indicates a
  problem, such as erroneous parameters, or bad or inaccessible data.  The
  status value is called variously exit code, exit status, or return code,
  and is described explicitly on reference pages only when special
  conventions apply.

RELATED INFORMATION
  Commands: man(1)

  Functions: exit(2)