?? input-tty
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# Require a controlling input `terminal'.tty -s || have_input_tty=noif test "$have_input_tty" = no; then echo "$0: This test must have a controlling input \`terminal'," 1>&2 echo " so it may not be run via \`batch', \`at', or \`rsh'." 1>&2 (exit 77; exit); exitfi?? 快捷鍵說明
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