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 System(  )

=== Description === Invokes the command processor to execute a command. If command is a null, the function only checks whether a command pr..."

2013-08-16T16:51:43Z

Created page with "<pre> System( <expression> ) </pre> === Description === Invokes the command processor to execute a command. If command is a null, the function only checks whether a command pr..."

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<pre>
System( <expression> )
</pre>

=== Description ===

Invokes the command processor to execute a command.

If command is a null, the function only checks whether a command processor is available through this function, without invoking any command.

The effects of invoking a command depend on the system and library implementation, and may cause a program to behave in a non-standard manner or to terminate.

=== Parameters ===

==== expression====

The expression can either be NULL to check if the command processor exists or a string to execute a command.

=== Return Value ===

If command is a null, the function returns a non-zero value in case a command processor is available and a zero value if it is not.

If command is not a null (ie a string), the value returned depends on the system and library implementations, but it is generally expected to be the status code returned by the called command, if supported.

=== Remarks ===

None.

=== Example ===

<syntaxhighlight lang="sputnik">
print ("Checking if processor is available...\n");
if (system(NULL))
print ("command processor is available and ready to use\n");
else
throw new exception("command is a null pointer");
printf ("Executing command ECHO Moo moo...\n");
my $i = system ("echo moo moo");
print ("The value returned was: $i.\n");
</syntaxhighlight>

[[Category:Core Function]]

Core Function System - Revision history

UberFoX: 1 revision

UberFoX: 1 revision

UberFoX: Created page with "
System( )
=== Description === Invokes the command processor to execute a command. If command is a null, the function only checks whether a command pr..."