system man page on DigitalUNIX

system man page on DigitalUNIX

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Digital UNIX Diffs - system(5)			Digital UNIX Diffs - system(5)

NAME
       system -	 Executes a shell command

LIBRARY
	Standard C Library (libc.a)

SYNOPSIS
       #include <stdio.h> #include <stdlib.h>

       int system (
	       const char ∗string );

PARAMETERS
       Specifies a valid shell command.

DIFFERENCES
       vms-system(5): OpenVMS Command Line Differences

       On  OpenVMS  the	 argument string must be a DCL command.	 On UNIX, this
       argument is sh(1) shell command.

       The return value of the function differs on the 2 system.  If the argu‐
       ment  string is null on OpenVMS, a 1 is returned.  On UNIX, this situa‐
       tion returns a 0 if the shell is	 inaccessible;	otherwise  a  positive
       value.

       A  successful  execution of the function returns an OpenVMS status code
       on OpenVMS.  UNIX returns a status in the form that wait(2) returns.

       vms-process(5): OpenVMS Process Model Differences

       On OpenVMS calling system(3) after a vfork(2)  but  before  the	corre‐
       sponding exec(2), will not work properly.  This works properly on UNIX.

RELATED INFORMATION
       Functions:  system(3), vfork(5)

CATEGORY INDEX
	vms-process(5), vms-system(5)

       delim off

						Digital UNIX Diffs - system(5)

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