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# tests of return value inversion
# placeholder for future expansion
# user subshells (...) did this wrong in bash versions before 2.04
! ( echo hello | grep h >/dev/null 2>&1 ); echo $?
! echo hello | grep h >/dev/null 2>&1 ; echo $?
! true ; echo $?
! false; echo $?
! (false) ; echo $?
! (true); echo $?
! true | false ; echo $?
! false | true ; echo $?
! (true | false) ; echo $?
! (false | true) ; echo $?
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