C++ exec() Function Guide

In C++, the exec() function is commonly used to execute external programs or commands. It is a system call function that can perform different operations by passing different parameters. In C++, the exec() function is usually combined with the fork() function, where after creating a child process, the child process uses the exec() function to load and execute external programs. There are multiple versions of the exec() function, such as execl(), execle(), execlp(), execv(), execve, each with differences in how parameters are passed and how executable files are searched for. The specific usage can vary depending on the needs, so different exec() functions can be chosen and appropriate parameters can be passed according to the requirements.