typedef struct c {
    char **pgmlist;
    struct c *next;
} Pgm;

typedef struct node { 
    Pgm  *pgm;
    char *rstdin;
    char *rstdout;
    char *rstderr;
    int bakground;
} Command;

extern void init( void );
extern int parse ( char *, Command *);
extern int nexttoken( char *, char **);
extern int acmd( char *, Pgm **);
extern int isidentifier( char * );