tests/redir3.sub

   1 read line1
   2
   3 echo read line1 \"$line1\"
   4
   5 exec 4<./redir3.in2
   6
   7 exec 5<&0
   8 exec 0<&4
   9
  10 read line2
  11
  12 echo read line2 \"$line2\"
  13
  14 exec 0<&5
  15
  16 read line3
  17
  18 echo read line3 \"$line3\"
  19
  20 exec 0<&4
  21
  22 read line4
  23
  24 echo read line4 \"$line4\"
  25
  26 exec 4<&-