> 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/execlp.md).

# exec Family: execlp

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

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

```c
execlp("ls","ls","-l",NULL);
```

we only need to provide the name of the program, it will search accordingly in the locations specified in `$PATH` variable.

For the program arguments, they are included directly into `execlp()` functions.

Lastly, default environment variables in systm are used.