sleep .5 # Waits 0.5 second. sleep 5 # Waits 5 seconds. sleep 5s # Waits 5 seconds. sleep 5m # Waits 5 minutes. sleep 5h # Waits 5 hours. sleep 5d # Waits 5 days.
int pid= fork(); if (pid==0) { // child execl("/bin/sleep", "sleep", argv[1], NULL); // argv[1] is the sleeptime perror("execl"); return EXIT_FAILURE; } if (waitpid(pid,NULL,0)<0) { perror("waitpid"); return EXIT_FAILURE; }