backcmd
STATIC void evalcommand(union node *, int, struct backcmd *);
backcmd->buf = memout.buf;
backcmd->nleft = memout.nextc - memout.buf;
backcmd->fd = pip[0];
backcmd->jp = jp;
evalbackcmd(union node *n, struct backcmd *result)
evalcommand(union node *cmd, int flgs, struct backcmd *backcmd)
void evalbackcmd(union node *, struct backcmd *);
struct backcmd in;