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# 错误检查
- shell中使用符号 `$?` 来显示上一条命令执行的返回值
- 返回值为 `0` 则代表执行成功
- 其他表示失败
- **PIPESTATUS** 是一个数组,记录了上一条管道命令中所有的返回值
- PIPESTATUS[0]: 第1个命令
- PIPESTATUS[1]: 第2个命令
- PIPESTATUS[2]: 第3个命令
…
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# 读取文件
- 使用 `while` 循环读取行
## 使用 `while` 循环读取行
```
while read myline
do
echo "LINE:"$myline
done < datafile.txt
```
- **如果文件最后一行之后没有换行符\n,则read读取最后一行时遇到文件结束符EOF,循环即终止。**
通过测试$line是否有内…
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# Shell Comment
## 单行注释
```
# this is comment test
```
## 多行注释
```
:
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first of all thank you for the answer and the project ...
well .... I bought the product from aliexpress and programmed the gpio example to see if it loaded ... now I have made a program for a gree…
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# Reactive Programming
Reactive programming is a programming paradigm that allows for handling changing data streams and updating the UI based on those changes. In Flutter, reactive programming can b…
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anhlt updated
5 years ago
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Salam
•
Apa bedanya Developer dan Engineering (siapa saja boleh isi ini) 😁🙏
•
Terimah Kasih
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### I. Meet the class
#### Constructor ``, ``, ``
#### Static
#### Encapsulation ``, ``, ``
### II. Relation between class/interface
#### Inheritance
#### Interface
#### Polymorphism ``, ``
#### Abstr…
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### Problem
Currently, we do not have any example about how to link CARLA C++ client with a C++ application.
I have tried to do it by my self quickly but was not trivial as after adding all the next h…
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We are working with NuttX from about 2016 year in university and industrial projects and we have contributed more drivers over years. For ESP32C3, we have contributed CAN/TWAI driver in past and @jano…
ppisa updated
1 month ago