Amazing stuff with system() in C / C++?


Here we will see some amazing results by using the system() function in C or C++. The system function is present in Windows, Linux and MAC operating systems. This function is used to execute the system commands that can be written in Command line.

Here we will see two usages if system function in C or C++. The first one is getting the IP configuration details using C++ program.

Example

#include <iostream>
#include <cstdlib>
using namespace std;
int main() {
   system("C:\\Windows\\System32\\ipconfig");
}

Output

Windows IP Configuration
Ethernet adapter Local Area Connection:
   Connection-specific DNS Suffix . : domain.name
   Link-local IPv6 Address . . . . . : fe80::302b:9dff:1cfb:ff01%10
   IPv4 Address. . . . . . . . . . . : 192.168.2.6
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   Default Gateway . . . . . . . . . : fe80::217:7cff:fe3d:31c8%10
                                       192.168.2.1
Ethernet adapter VirtualBox Host-Only Network:
   Connection-specific DNS Suffix . :
   Link-local IPv6 Address . . . . . : fe80::5c79:a124:f5b9:e0b7%13
   Autoconfiguration IPv4 Address. . : 169.254.224.183
   Subnet Mask . . . . . . . . . . . : 255.255.0.0
   Default Gateway . . . . . . . . . :
Ethernet adapter VirtualBox Host-Only Network #2:
   Connection-specific DNS Suffix . :
   Link-local IPv6 Address . . . . . : fe80::7c54:289:9257:dd7a%16
   IPv4 Address. . . . . . . . . . . : 192.168.243.2
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   Default Gateway . . . . . . . . . :
Tunnel adapter Teredo Tunneling Pseudo-Interface:
   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix . :
Tunnel adapter isatap.{E12FA520-1578-4264-A565-A1270D18177A}:
   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix . :
Tunnel adapter isatap.{A01195C5-0A34-4E50-89CB-4C391165B7C3}:
   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix . :
Tunnel adapter isatap.domain.name:
   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix . : domain.name

The second one is more interesting. Using this we can turn off our computer. We will just write the shutdown program path inside the system function.

Example

#include <iostream>
#include <cstdlib>
using namespace std;
int main() {
   system("C:\\WINDOWS\\System32\\shutdown /s");
}

Output

One box will appear. It will tail the system is shutting down, then it will be shut down.
raja
Published on 31-Jul-2019 13:18:06
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