ast_comparator/test/student_data/handout/shlab-handout/cases/reference_8_tsh.c
/*
 * builtin_cmd - If the user has typed a built-in command then execute
 *    it immediately.
 */
If the user has typed a built-in command then execute
it immediately.
If the user has typed a built - in command then execute it immediately .
int builtin_cmd(char **argv)
{
    if(!strcmp(argv[0],"quit"))
        exit(0);
    if(!strcmp(argv[0],"&"))
        return 1;
    if(!strcmp(argv[0],"bg")||!strcmp(argv[0],"fg")){
        do_bgfg(argv);
        return 1;
    }
    if(!strcmp(argv[0],"jobs")){
        listjobs(jobs);
        return 1;
    }
    return 0;     
}
int builtin_cmd ( char * * argv ) { if ( ! strcmp ( argv [ 0 ] , " " ) ) exit ( 0 ) ; if ( ! strcmp ( argv [ 0 ] , " " ) ) return 1 ; if ( ! strcmp ( argv [ 0 ] , " " ) || ! strcmp ( argv [ 0 ] , " " ) ) { do_bgfg ( argv ) ; return 1 ; } if ( ! strcmp ( argv [ 0 ] , " " ) ) { listjobs ( jobs ) ; return 1 ; } return 0 ; }
builtin_cmd - If the user has typed a built-in command then execute
    it immediately.
builtin_cmd - If the user has typed a built - in command then execute it immediately .
//strcmp compares the users type in with following commands:quit, &, bg, fg, jobs /* not a builtin command */