| echo ! printing ! |
| ! false |
| echo $? |
| ! true |
| echo $? |
| if ! false; then false; echo $?; fi |
| echo $? |
| if ! false; then ! false; echo $?; fi |
| echo $? |
| for a in ! a b c; do echo $a; done |
| for a in ! a b c; do ! echo -n "$a "; echo $?; done |
| for a in ! a b c; do ! /bin/echo -n "$a "; echo $?; done |
| for a in ! a b c; do ! echo -n "$a " | false; echo $?; done |
| for a in ! a b c; do ! echo -n "$a " | true; echo $?; done |
| for a in ! a b c; do ! { echo -n "$a " | false; }; echo $?; done |
| for a in ! a b c; do ! { echo -n "$a " | true; }; echo $?; done |