mdb_cmd_create
extern mdb_cmd_t *mdb_cmd_create(mdb_idcmd_t *, mdb_argvec_t *);
pipeline: pipeline '|' command { mdb_cmd_create($3, &mdb.m_frame->f_argvec); }
cp = mdb_cmd_create($5, &mdb.m_frame->f_argvec);
cp = mdb_cmd_create($4, &mdb.m_frame->f_argvec);
| command { mdb_cmd_create($1, &mdb.m_frame->f_argvec); }