getusershell
char *getusershell(void);
if (!(sh = getusershell())) {
while ((cp = getusershell()) != NULL)
while ((sh = getusershell())) {
while ((sh = getusershell())) {
while ((sh = getusershell()) != NULL)
while ((sh = getusershell()) != NULL) {
while ((cp = getusershell()) != NULL && !r)