execl("/bin/ls","ls",NULL);

#include<unistd.h>
#include<stdio.h>
#include<stdlib.h>

void myexec(const char* path,const char* argv)
{
    chdir(path);
    system(argv);
    exit(100);   
}


int main(int argc,char *argv[])
{
    if(argc!=3)
    {
        printf("USAGE:%s <path> <command>\n",argv[0]);
        exit(1);
    }   
    if( fork() == 0)
    {
        myexec(argv[1],argv[2]);
    } 
    else
    { 
          exit(0);      
     }
    printf("this should never be executed");    
}

[c_d@localhost cfiles]$ gcc 1.c
[c_d@localhost cfiles]$ ./a.out /bin/ls ls
1.c      a.out         fcopy.c~  frevread.c~    msg~     prgm1.c~  prgm2.c~  prgm3.c~  prgm4.c~  prgm5.c~  prgm7.c     sth~
1.c~      cfiles.tar.7z  file1~    key.c    prgm1     prgm2       prgm3     prgm4     prgm5     prgm6.c   prgm7.c~
alpha.c~  f1~         fread.c~  key.c~    prgm1.c  prgm2.c   prgm3.c   prgm4.c   prgm5.c     prgm6.c~  printip.c~
[c_d@localhost cfiles]$

[c_d@localhost cfiles]$ ./a.out /home/c_d/workspace/unix/shellscripts/ ./leapyear_prgm07.sh
2009 is not a leap year
[c_d@localhost cfiles]$

execl ("/bin/ls", "ls", "-l", (char *)0);

execl ("/bin/ls", "ls -l", (char *)0);