bash 如何使case语句匹配数字范围？
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How to make case statement match a number range?
提问by shamik
I'm running a switch case with column numbers which can be in the range 0 - 50. Now each case supports discrete column number and I observe its failure.
我正在运行一个列号可以在 0 - 50 范围内的 switch case。现在每个 case 都支持离散列号，我观察到它的失败。
Here is the code:
这是代码：
i=10
a=1
b=0.65
if [ "$a" != "$b" ]; then
case $i in
[1]|[2]|[5]) echo "Not OK"; ;;
[9-10]|[12]) echo "may be ok"; ;;
*) echo "no clue - $i"; ;;
esac
fi
I expect this code to output may be okbut get no clue - 10.
我希望此代码输出may be ok但得到no clue - 10.
回答by Arnon Zilca
Bash casedoesn't work with numbers ranges. []is for shell patterns.
Bashcase不适用于数字范围。[]用于贝壳图案。
for instance this case [1-3]5|6)will work for 15 or 25 or 35 or 6.
例如，这种情况[1-3]5|6)适用于 15 或 25 或 35 或 6。
Your code should look like this:
您的代码应如下所示：
i=10
a=1
b=0.65
if [ "$a" != "$b" ] ; then
case $i in
1|2|5) echo "Not OK"; ;;
9|10|12) echo "may be ok"; ;;
*) echo "no clue - $i"; ;;
esac;
fi
If ican be realbetween9 and 10 then you'll need to use if(instead of case) with ranges.
如果i可以real在9 到 10之间，那么您需要使用if（而不是大小写）范围。
