std::system
From cppreference.com
| Defined in header <cstdlib>
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| int system( const char* command ); |
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Calls the host environment's command processor (e.g. /bin/sh, cmd.exe, command.com) 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.
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[edit] 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 |
[edit] Return value
Implementation-defined value. If command is a null pointer, returns a nonzero value if and only if the command processor exists.
[edit] 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.
[edit] Example
Run this code
#include <cstdlib> #include <fstream> #include <iostream> int main() { std::system("ls -l >test.txt"); // execute the UNIX command "ls -l >test.txt" std::cout << std::ifstream("test.txt").rdbuf(); }
Possible output:
total 16 -rwxr-xr-x 1 2001 2000 8859 Sep 30 20:52 a.out -rw-rw-rw- 1 2001 2000 161 Sep 30 20:52 main.cpp -rw-r--r-- 1 2001 2000 0 Sep 30 20:52 test.txt
[edit] See also
| C documentation for system
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