> For the complete documentation index, see [llms.txt](https://eric-lo.gitbook.io/lab4-process/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://eric-lo.gitbook.io/lab4-process/process-execution/exec-family-execvp.md).

# exec Family: execvp

```c
/* Exec/execvp.c */
#include <stdio.h>
#include <unistd.h>
int main(int argc,char *argv[])
{
    char *arg[] = {"ls","-l",NULL};
    printf("Using *execvp* to exec ls -l ...\n");
    execvp("ls",arg);
    printf("Program Terminated\n");
    return 0;
}
```

`execvp()` uses *filename*, *argument array* and *original ENV* to execute the program.

```c
execvp("ls",arg);
```

It only takes a filename to invoke the program, and it is searched in paths specified in `$PATH` in sequence.

The arguments are listed in an array of `char*` and passed to the function.

Original environment variables are used in a new program environment.