VREADONLY
int flag = p[0] == 'r'? VREADONLY : VEXPORT;
if (pflg || flag == VREADONLY
if (nflg || flag == VREADONLY)
if (vp->flags & VREADONLY && !(unexport & 1))
if ((vp->flags&(VEXPORT|VSTRFIXED|VREADONLY|VNOEXPORT)) == 0) {
setvar("PPID", buf, VREADONLY);
, VTEXTFIXED|VREADONLY|VNOEXPORT);
if (vp->flags & VREADONLY) {