exec Family: execle

/* Exec/execle.c */
#include <stdio.h>
#include <unistd.h>
int main(int argc,char *argv[])
{ 
    char *env[] = {"LS_COLORS=fi=04;33;44",NULL}; 
    printf("Using *execle* to exec ls -l\n"); 
    execle("/bin/ls","ls","-l","--color",NULL,env); 
    printf("Program Terminated\n");
    return 0;
}

execlp() uses pathname, argument list and provided ENV to execute the program.

execle("/bin/ls","ls","-l","--color",NULL,env);

You need to provide the exact location (pathname) in order to execute it.

For the arguments, they are specified directly in the execle() function.

You can define new environment variables in the function. The environment variables are in a char* array. In this example, the behaviour of ls can be changed by the variables. In this case, the colors for displaying files and directories are changed.