bash 参数过多 [if 语句]
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Too many arguments [if statements]
提问by Kyler
So everything in my code works, all but the multiplication one(*)
所以我的代码中的所有内容都有效，除了乘法 one(*)
ex4.sh: line 23: [: too many arguments
ex4.sh: line 26: [: too many arguments
ex4.sh: line 29: [: too many arguments
ex4.sh: line 32: [: too many arguments
Heres the script it asks you for a 2 numbers entered separately then an operation + being addition - being subtraction / being division and * being multiplication. Everything works all but multiplication which gives a too many arguments error
这是脚本，它要求您分别输入 2 个数字，然后进行运算 + 加法 - 减法 / 除法和 * 乘法。一切正常，但乘法会产生太多参数错误
echo First number
read NUM1
if ! [[ "$NUM1" =~ ^[0-9]+$ ]]; then
echo Integers only please
else
echo Second number
read NUM2
if ! [[ "$NUM2" =~ ^[0-9]+$ ]]; then
echo Integers only please
else
echo What operation would you like to do?+/-*
read OPERATION
if [ $OPERATION = "+" ]; then
echo Answer
expr $NUM1 + $NUM2
elif [ $OPERATION = "/" ]; then
echo Answer
expr $NUM1 / $NUM2
elif [ $OPERATION = "-" ]; then
echo Answer
expr $NUM1 - $NUM2
elif [ $OPERATION = "*" ]; then
echo Answer
expr $NUM1 * $NUM2
else
echo Please enter one of +/-*
fi
fi
fi
回答by V. Michel
if [[ $OPERATION = "+" ]]; then
echo Answer
expr $NUM1 + $NUM2
elif [[ $OPERATION = "/" ]]; then
echo Answer
expr $NUM1 / $NUM2
elif [[ $OPERATION = "-" ]]; then
echo Answer
expr $NUM1 - $NUM2
elif [[ $OPERATION = "*" ]]; then
echo Answer
expr $NUM1 \* $NUM2
else
echo Please enter one of +/-*
回答by nabeel
first of all according to the error you are getting, all if statements after "read OPERATION" are failing.
首先，根据您得到的错误，“读取操作”之后的所有 if 语句都失败了。
try using [[ ]] instead of [ ] for the if statements
尝试在 if 语句中使用 [[ ]] 而不是 [ ]
plus, its more recommended to wrap the strings with ""
另外，更推荐用“”包裹字符串
