ash_test/ash-invert/invert.tests

# 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 $?
1	# tests of return value inversion
2	# placeholder for future expansion
3
4	# user subshells (...) did this wrong in bash versions before 2.04
5
6	! ( echo hello \| grep h >/dev/null 2>&1 ); echo $?
7	! echo hello \| grep h >/dev/null 2>&1 ; echo $?
8
9	! true ; echo $?
10	! false; echo $?
11
12	! (false) ; echo $?
13	! (true); echo $?
14
15	! true \| false ; echo $?
16	! false \| true ; echo $?
17
18	! (true \| false) ; echo $?
19	! (false \| true) ; echo $?