?? invert.tests
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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 $??? 快捷鍵說明
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