我正在尝试在 Shellscript(Bash) 中创建一个简单的程序来计算 2 的补码二进制数。
作为测试，我只使用了 8 位二进制值 (00000100)，但我不断收到“Bad Substitution”错误，我不知道为什么。
#!/bin/bash
binary=00000100
firstBit=${binary:0:1}
secondBit=${binary:1:1}
thirdBit=${binary:2:1}
fourthBit=${binary:3:1}
fifthBit=${binary:4:1}
sixthBit=${binary:5:1}
seventhBit=${binary:6:1}
eighthBit=${binary:7:1}
binaryNew=""
if [[ $firstBit == "1" ]]
then
binaryNew=0
if [[ $secondBit == "1" ]]
then
binaryNew+=0
else
binaryNew+=1
if [[ $thirdBit == "1" ]]
then
binaryNew+=0
else
binaryNew+=1
if [[ $fourthBit == "1" ]]
then
binaryNew+=0
else
binaryNew+=1
if [[ $fifthBit == "1" ]]
then
binaryNew+=0
else
binaryNew+=1
if [[ $sixthBit == "1" ]]
then
binaryNew+=0
else
binaryNew+=1
if …