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

main()
{
char cmd[32];
int i = 0 ;

while (1)
   {
        write(1,"CI>",3);
        while ( ( read ( 0 , &cmd[i] , 1) ) && cmd[i]  != '\n'  )
                {
                if ( cmd[i] == ' ') continue;
                else
                         ++i;
                }
        if ( cmd [i] == '\n' ) cmd[i] = '\0';
        if (  strcmp(cmd,"quit")  == 0 ) exit(0) ;
        else
        {
          if (  fork() ) {
            wait();
            i=0;
          }
          else {
           if ( execlp(cmd,cmd,0) < 0) {
           printf("cannot execute %s\n", cmd);
           exit(1);
           }
          }
        }
   }    /*  while  */
}