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  C Program to show an example of fork and exec System Calls # include <stdio.h> # include <unistd.h> # include <stdlib.h> # include <sys/types.h> int main ( ) { pid_t pid ; char * args [ ] = { "/bin/ls" , "-l" , 0 } ; printf ( "Parent Process PID :%d" , getpid ( ) ) ; pid = fork ( ) ; if ( pid == 0 ) { printf ( "\nChild process PID :%d and Parent process is: %d\n" , getpid ( ) , getppid ( ) ) ; } else { wait ( ) ; execv ( "/bin/ls" , args ) ; exit ( 0 ) ; } }