wushifu32

:smill: 👍 🐶 :Doge:

wushifu32

:smill:

wushifu32

#!/bin/sh

cat tag.files | xargs -i find $PWD/{} -name "*.[chS]" > cscope.files
ctags `cat cscope.files`
cscope -bkq

wushifu32

const int ci = i, &cr = ci;
auto b = ci;  // b is an int
auto c = cr;  // c is an int
auto d = &i;  // d is an int*
auto e = &ci; // e is an const int*
const auto f = ci;  // f is an const int

auto sz = 0, pi = 3.14; // ERROR: inconsistent types for sz and pi

wushifu32

typedef char *pstring;
// 此处表示指针为 constant
const pstring cstr = 0;

/************对比#define******/
#define pstring char*
// 展开后即为 const char* cstr；意为一个指向 const char 的指针
const pstring cstr;

wushifu32

这样，重启系统后，用户“user_name”就会加入dialout组了，之后我们就能自由自在地访问ttyS设备了

sudo usermod -a -G dialout user_name

wushifu32

For printf, the * allows you to specify minimum field width through an extra parameter
i.e. printf("%*d", 4, 100); specifies a field width of 4.

For scanf, the * indicates that the field is to be read but ignored
i.e. scanf("%*d %d", &i); for the input "12 34" will ignore 12 and read 34 into the integer i.

wushifu32

# 拷贝 flash
sudo ./flash.sh -r -k APP -G xxx.img jetson-tx2 mmcblk0p1

# 烧写 flash
cp xxx.img Linux_for_Tegra_tx2/bootloader/system.img
sudo ./flash.sh -r jetson-tx2 mmcblk0p1

wushifu32

#!/bin/bash

# for 循环
for i in {1..100}  
do  
    echo $i  
done  

# IF 条件判断
if [ $a == $b ]

wushifu32

通过云服务器A（123.123.123.123）连接设备B

1. 将B的公钥传送到A上：

ssh-copy-id user@123.123.123.123

ssh user@host 'mkdir -p .ssh && cat >> .ssh/authorized_keys' < ~/.ssh/id_rsa.pub

此时通过SSH链接A就不需要输入密码了，如果不行，检查A的/etc/ssh/sshd_config这个文件，检查下面几行前面"#"注释是否取掉：