#!/bin/sh while : do echo $E_FLAG "Which system-call library do you want to install for the VAX? You can choose between libbsd4_1a for Berkeley Unix 4.1 libbsd4_2 for Berkeley Unix 4.2 or newer, or Ultrix libsysV_2 for Unix System V Your choice: [$SYSVAX] $E_SFX" . $FDIR/get_answer case $ANS in '') ANS="$SYSVAX";; esac SYSVAX="$ANS" case $SYSVAX in libbsd4_1a|libbsd4_2|libsysV_2) break ;; *) echo "I do not understand your answer ($SYSVAX). Try again" ;; esac done