?? param_test.sh
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#!/bin/bash#param_test.sh#dxzhang@ustc.eduecho "1: "A=1234B=$Aecho $Aecho $Becho "2: "unset AB=${A-2345}echo $Aecho $Becho "3: "A=B=${A-3456}echo $Aecho $Becho "4: "A=B=${A:-4567}echo $Aecho $Becho "5: "A=B=${A+5678}echo $Aecho $Becho "6: "unset AB=${A+6789}echo $Aecho $Becho "7: "A=B=${A?7890}echo $Aecho $Becho "8: "unset AB=${A?8901}echo $Aecho $B?? 快捷鍵說明
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