[英]strange errors on bash script
警告:我最近才剛開始學習bash,並嘗試做一個可計算項的遞歸函數...所以...
x0 = 0 x1 = 1 xm = 3 * xm-1-2 * xm-2
我到目前為止編寫的函數是:
#!/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
但是我遇到了一些奇怪的錯誤……不確定我是否正確執行了……誰能告訴我是什么原因導致這些問題並更正了我的代碼,從而可以正常工作? 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 "=")
不太確定您的計算結果,但是您在語法上清理的基本腳本就是這個:
#!/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
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