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system

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

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

-

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

-

Parameters

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

Return value

Implementation-defined value. If command is a null pointer, returns a nonzero value if and only if the command processor exists.

-

Notes

On POSIX systems, the return value can be decomposed using WEXITSTATUS and WSTOPSIG.

-

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

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Example

In this example there is a system call of the unix command date +%A and a system call to (possibly installed) gcc compiler with command-line argument (--version):

-
#include <stdlib.h>
- 
-int main(void) {
-    system("date +%A");
-    system("gcc --version");
-}

Possible output:

-
Wednesday
-gcc (GCC) 11.2.0
-...

References

See also

-
C++ documentation for system
-

- © cppreference.com
Licensed under the Creative Commons Attribution-ShareAlike Unported License v3.0.
- https://en.cppreference.com/w/c/program/system -

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