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intro(1)                FreeBSD General Commands Manual               intro(1)

       intro - introduction to commands

       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

       (1int)    Commands used for internationalization.  For more information

       (1mh)     Commands specific to the Message Handler.

       (1ncs)    Commands used for NCS (Network Computing System).

       (1sh5)    Commands interpreted by the sh5 (System V Release 2) shell.

       (1yp)     Commands specific to the Yellow Pages (YP) service.

       Commands related to system maintenance used to appear in section 1
       reference pages and were distinguished by (1m) at the top of the page.
       These reference pages now appear in section 8.

       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.  For more information,
       see and The former byte is 0 for normal termination; the latter is
       customarily 0 for successful execution.  A nonzero status indicates a
       problem such as erroneous parameters, or bad or inaccessible data.  It
       is called variously exit code, exit status, or return code, and is
       described only where special conventions are involved.


Name | Description | Diagnostics

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