NAME

intro − introduction to commands

DESCRIPTION

This section describes publicly accessible commands for general utility.  In addition, some special commands for communication purposes are described.  All commands are listed in alphabetic order. 

DIAGNOSTICS

Upon termination, each command returns two bytes of status; one is supplied by the system giving the cause for termination, and (in the case of normal termination) one supplied by the program.  The former byte is 0 for normal termination; the latter is customarily 0 for successful execution, nonzero to indicate troubles such as erroneous parameters, bad or inaccessible data, or other inability to cope with the task at hand.  It is called exit code, exit status, or return code, and is described only where special conventions are involved.