6 if ! false; then false; echo $?; fi
8 if ! false; then ! false; echo $?; fi
10 for a in ! a b c; do echo $a; done
11 for a in ! a b c; do ! printf "$a "; echo $?; done
12 for a in ! a b c; do ! /usr/bin/printf "$a "; echo $?; done
13 for a in ! a b c; do ! printf "$a " | false; echo $?; done
14 for a in ! a b c; do ! printf "$a " | true; echo $?; done
15 for a in ! a b c; do ! { printf "$a " | false; }; echo $?; done
16 for a in ! a b c; do ! { printf "$a " | true; }; echo $?; done