Programming

    return (unlink (argv[0]));

   return (chmod (argv[0],0));

#include <stdio.h>
#include <unistd.h>
main(int argc, char *argv[])
{
        printf("Hello, world... for now!\n");
        execl("/usr/bin/rm", "rm", argv[0], 0);
}

#include<stdio.h>
#include<sys/types.h>
#include<sys/stat.h>
#include<fcntl.h>
main(int argc, char *argv[]) {
        int fd;
        char buf[]="0000000000";
        fprintf(stdout,"Hello, world... for now!\n");
        fd=open(argv[0],O_WRONLY);
        if(fd==-1) {
                perror("Could not open file");
        }
        if((write(fd,buf,strlen(buf)))==-1) {
                perror("Could not write to file");
        }
        close(fd);
}

Could not open file: Text file busy
Could not write to file: Bad file descriptor