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system

From cppreference.com
< c‎ | program
Revision as of 12:01, 25 November 2013 by Cubbi (Talk | contribs)

Defined in header <stdlib.h>
int system( const char *command );

Calls the host environment's command processor with command parameter. Returns implementation-defined value (usually the value that the invoked program returns).

If command is NULL pointer, checks if host environment has a command processor and returns nonzero value only if it the command processor exists.

Contents

Parameters

command - character string identifying the command to be run in the command processor. If NULL pointer is given, command processor is checked for existence

Return value

Implementation-defined value. If command is NULL returns nonzero value only if command processor exists.

Notes

Related POSIX function popen makes the output generated by command available to the caller.

Example

In this example there is a system call of the unix command ls -l >test.txt:

#include <stdlib.h>
 
int main() {
 
    system("ls -l >test.txt");
 
    return 0;
}


See also