在bash腳本

Question

警告奇怪的錯誤* XM-1 - 2 * XM-2

我寫了到目前爲止的功能是：

#!/bin/bash 
calculate() 
{ 
if [ $1 -eq 0 ] 
then 
echo "0" 
fi 
if [ $1 -eq 1 ] 
then 
echo "1" 
fi 
if [ $1 -ge 1 ] 
then 
let var1 = `calculate [ $1-1 ]`; 
let var2 = `calculate [ $1-2 ]`; 
let var3 = 3*var1-2*var2; 
echo var3 
fi 
} 
calculate 3 

但我得到一些奇怪的錯誤...不知道我是否正確地做到了......能任何人告訴我是什麼原因導致這些問題，並糾正我的代碼，使其工作？非常感謝。

錯誤：

TP1p1.sh: line 4: [: [: integer expression expected 
TP1p1.sh: line 8: [: [: integer expression expected 
TP1p1.sh: line 12: [: [: integer expression expected 
TP1p1.sh: line 14: let: =: syntax error: operand expected (error token is "=") 
TP1p1.sh: line 4: [: [: integer expression expected 
TP1p1.sh: line 8: [: [: integer expression expected 
TP1p1.sh: line 12: [: [: integer expression expected 
TP1p1.sh: line 15: let: =: syntax error: operand expected (error token is "=") 
TP1p1.sh: line 16: let: =: syntax error: operand expected (error token is "=") 

Answer 1

嘛不知道你的計算，但你的語法清理基地腳本是這一個：

#!/bin/bash 
calculate() { 
if [ $1 -eq 0 ]; then 
    echo -n "0" 
elif [ $1 -eq 1 ]; then 
    echo -n "1" 
elif [ $1 -ge 1 ]; then 
    var1=$(calculate $(($1-1))) 
    var2=$(calculate $(($1-2))) 
    var3=$((3*(var1-2)*var2)) 
    echo $var3 
fi 
} 
calculate 5