4BSD/usr/man/cat1/intro.1

INTRO(1)            UNIX Programmer's Manual             INTRO(1)



NAME
     intro - introduction to commands

DESCRIPTION
     This section describes publicly accessible commands in
     alphabetic order.  Certain distinctions of purpose are made
     in the headings:

     (1)  Commands of general utility.

     (1C) Commands for communication with other systems.

     (1G) Commands used primarily for graphics and computer-aided
          design.

     N.B.: Commands related to system maintenance, which appeared
     in section 1, distinguished by (1M), in previous versions of
     the manual have been moved to section 8, as they are of lit-
     tle interest to most users.

     The word `VAX-11' at the foot of a page means that some or
     all of the description applies only to the implementation
     for the Digital Equipment Corporation VAX-11.  Pages added
     or changed between the distribution of UNIX/32V and the
     Berkeley Distribution indicate `3rd Berkeley Distribution'
     or `4th Berkeley Distribution' at the lower left, as
     appropriate.

SEE ALSO
     Section (6) for computer games, section (8) for system
     maintenance commands.

     _H_o_w _t_o _g_e_t _s_t_a_r_t_e_d, in the Introduction.

DIAGNOSTICS
     Upon 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, see _w_a_i_t and _e_x_i_t(2).  The former byte is 0 for
     normal termination, the latter is customarily 0 for success-
     ful execution, nonzero to indicate troubles such as errone-
     ous parameters, bad or inaccessible data, or other inability
     to cope with the task at hand.  It is called variously `exit
     code', `exit status' or `return code', and is described only
     where special conventions are involved.










Printed 11/10/80                                                1