7 ! true | false; echo $?
10 ! false | true; echo $?
11 echo "exit 2 | exit 3 | exit 4:"
12 exit 2 | exit 3 | exit 4; echo $?
13 ! exit 2 | exit 3 | exit 4; echo $?
19 ! true | true; echo $?
22 ! true | false; echo $?
25 ! false | true; echo $?
26 echo "exit 2 | exit 3 | exit 4:"
27 exit 2 | exit 3 | exit 4; echo $?
28 ! exit 2 | exit 3 | exit 4; echo $?
34 ! true | true; echo $?
37 ! true | false; echo $?
40 ! false | true; echo $?
41 echo "exit 2 | exit 3 | exit 4:"
42 exit 2 | exit 3 | exit 4; echo $?
43 ! exit 2 | exit 3 | exit 4; echo $?