From Abrupt Earthworm, 4 Months ago, written in Plain Text.
  1. echo "S1"
  2. su -l -c "
  3.     echo 'S2'
  4.     sh -c '
  5.         echo S3
  6.         env zsh -l
  7.         echo E3
  8.     '
  9.     echo 'E2'
  10. " -s /bin/bash user
  11. echo "E1"
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