我有这个脚本:
#!/bin/bash
menu()
{
while true; do
opt=$(whiptail \
--title "Select an item" \
--menu "" 20 70 10 \
"1 :" "Apple" \
"2 :" "Banana" \
"3 :" "Cherry" \
"4 :" "Pear" \
3>&1 1>&2 2>&3)
rc=$?
echo "rc=$rc opt=$opt"
if [ $rc -eq 255 ]; then # ESC
echo "ESC"
return
elif [ $rc -eq 0 ]; then # Select/Enter
case "$opt" in
1\ *) echo "You like apples"; return ;;
2\ *) echo "You go for bananas"; return ;;
3\ *) echo "I like cherries too"; return ;;
4\ *) echo "Pears are delicious"; return ;;
*) echo "This is an invalid choice"; return ;;
esac
elif [ $rc -eq 1 ]; then # Cancel
echo "Cancel"
return
fi
done
}
menu
当我按下 ESC 按钮时,输出如预期:
rc=255 opt=
ESC
现在,通过创建opt
一个local
变量,行为是不同的:
...
local opt=$(whiptail \
...
输出:
rc=0 opt=
This is an invalid choice
有人可以解释一下吗?