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+# IDE笔记
+## 安装VScode:
+url:https://code.visualstudio.com/
+
+![alt text](image.png)
+
+- 因为我这边使用的系统是Linux所以是.deb或者.rpm随便下载哪个都可以。
+
+![alt text](image-1.png)
+
+- 下载完成后使用命令dpkg -i 加安装包名称进行安装。
+
+![alt text](image-2.png)
+
+这样就安装成功了。
+
+- 安装完成后可以在application中找到。
+
+![alt text](image-3.png)
+
+- 点击打开出现了报错，先不要急。
+
+![alt text](image-4.png)
+
+- 我们通过命令行启动，发现原因是因为尝试使用超级用户，可以添加"--no-sandbox"
+
+![alt text](image-5.png)
+
+- 使用命令code --no-sandbox重新启动
+
+![alt text](image-6.png)
+
+这样就启动成功了。
+
+## 插件安装市场
+- 插件安装市场位于最左侧的菜单栏中，用于安装开发环境中所用到的一些拓展，如语法提示之类的。
+
+![alt text](image-7.png)
+
+点击后会弹出一个小的页面，在小页面的上方有一个搜索框，可以快速查找所需要的插件，installer中会展示我们已经安装过的插件，点击插件后的install可安装对应插件。
+
+
+## 关于其他区域划分可参考下图
+
+![alt text](image-8.png)
+
+## 在vscode的欢迎页中有一些引导配置，比如我们可以选择自己喜欢的主题，其他的有兴趣可以自己研究一下。
+
+![alt text](image-9.png)
+
+
+## 文件菜单介绍
+文件菜单用于新建文件或者快速打开我们本地的项目，在部分文件菜单的子项右边有快捷键的说明，记住这些快捷键能够提高开发效率。
+
+![alt text](image-10.png)
+
+## 查看菜单介绍
+查看菜单用于设置开发功能区的显示与隐藏，当我们意外关闭某个功能区时可以在此处重新打开。
+
+![alt text](image-11.png)
+
+- 以上两个菜单是我们开发时最常用的，关于其他菜单用的不多，点一下看看了解就行了。
+
+## VScode 交互演练场
+交互演练场中我们可以学到一些快速操作的技巧，入口位于Help>Editor Playground
+
+### 技巧1：快速选中
+
+- 摁住Alt+shift 移动光标可以快速选中任意矩形范围内容。
+
+![alt text](image-12.png)
+
+- 摁住Alt+shift+上下可以拓展光标长度同时修改多行内容
+
+![alt text](image-13.png)
+
+- 选中一个单词后，使用ctrl+shift+L可以快速选中全文中出现的这个单词
+
+![alt text](image-14.png)
+
+### 技巧2：智能提示
+- 在写代码时可以使用crtl+空格键快速获取提示信息。
+
+![alt text](image-15.png)
+
+### 技巧3：行操作
+- 使用alt+上下键可快速移动光标行到上下位置。
+
+![alt text](image-16.png)
+![alt text](image-17.png)
+
+### 技巧4：重命名
+- 选中类名，使用F2，可根据上下文快速对代码中所有关联内容进行重命名。
+
+![alt text](image-18.png)
+![alt text](image-19.png)
+
+### 技巧5：快速排版
+- 使用ctrl+shift+i 可以快速对代码进行格式化。
+
+![alt text](image-20.png)
+![alt text](image-21.png)
+
+### 技巧6: 快速折叠
+- 使用ctrl+shift+[可以快速折叠代码，使用ctrl+shift+]可快速展开。
+
+![alt text](image-22.png)
+![alt text](image-23.png)
+
+- 除了上面讲到的技巧，在练习场还有很多其他技巧，有时间可以自由探索。
+
+# VSCode基础配置
+
+## 字体配置
+- 字体过小开发时会加重我们的负担，此时我们需要对字体大小进行配置，打开设置（ctrl+,）
+
+![alt text](image-24.png)
+
+- 在这个页面，我们能看到font Size、Font Famil等内容，根据需要可自行配置，此处我们修改字体大小为20.
+
+![alt text](image-25.png)
+
+- 修改后
+
+![alt text](image-27.png)
+
+## 配置重启后打开空白项目
+- 设置中搜索restore 设置为None即可
+
+![alt text](image-28.png)
+
+## 配置重启后什么都不打开
+- 设置中搜索startup 设置为None即可
+
+![alt text](image-29.png)
+
+## 配置退出时提示是否保存
+- 设置中搜索hot exit 设置为off
+
+![alt text](image-30.png)
+
+## 设置打开文件只预览，不修改
+- 设置中搜索preview 勾选enable preview选框
+
+![alt text](image-32.png)
+
+## 光标设置
+- 设置中搜索cursor可以对光标进行自定义配置
+
+![alt text](image-33.png)
+
+- 到这里我们的VSCode基本上就够用了下面让我们进入git学习。
+
+# git学习
+
+## 安装
+- 在linux 中我们可以直接使用命令apt install git -y 安装git程序。
+
+![alt text](image-34.png)
+
+## 设置用户签名
+- 设置用户签名用于提交代码时表明身份
+git config --global user.name "Al17er"
+
+![alt text](image-35.png)
+
+git config --gloabl user.email "aaa@qq.com"
+
+![alt text](image-36.png)
+
+## 初始化本地库
+- 初始化本地库使git获取项目管理权。
+git init
+
+![alt text](image-37.png)
+
+## 查看本地库状态
+git status
+
+![alt text](image-38.png)
+
+- 第一行表明当前在master分支
+- 第二行表明当前没有提交记录
+- 第三行表明当前没有要提交的内容
+
+- 目录下新增文件后查看状态发现状态多了提交文件
+
+![alt text](image-39.png)
+
+## 添加暂存区
+git add
+
+![alt text](image-40.png)
+
+- 再次查看状态
+
+![alt text](image-41.png)
+
+- 此时文件存储在暂存区还是可以删除的，通过命令git rm --cached hello.txt,这个命令只会删除暂存区不会删除本地文件。
+
+![alt text](image-42.png)
+
+
+## 提交文件
+git commit -m "日志信息" 文件名
+
+![alt text](image-43.png)
+
+- 再次查看日志
+
+![alt text](image-44.png)
+
+## 查看日志
+git reflog //精简日志
+git log  //详细日志
+
+![alt text](image-45.png)
+
+## 修改文件
+
+![alt text](image-46.png)
+
+- 添加文件至暂存区
+
+![alt text](image-47.png)
+
+- 提交文件
+
+![alt text](image-48.png)
+
+## 穿梭版本
+git reset --hard 版本号
+
+![alt text](image-49.png)
+
+## 分支概念
+- 在版本控制中，为了同时推进多个任务进行，如在程序开发时，为了同时保证用户使用，和程序开发进程，就可以创建一个生产分支和1个开发分支。
+
+
+## 查看分支
+git branch -v
+
+![alt text](image-50.png)
+
+
+## 创建分支
+git branch 分支名
+
+![alt text](image-51.png)
+
+## 切换分支
+git checkout 分支名
+
+![alt text](image-52.png)
+
+## 分支合并
+git merge 分支名
+
+![alt text](image-53.png)
+
+## 冲突合并
+当两个分支中存在同一文件但不统一意见时就会冲突。
+此时需要手动处理冲突文件，并重新添加提交。
+
+## 创建远程库
+- 登录github>>your repository>>new
+
+![alt text](image-54.png)
+
+- 点击crete创建
+![alt text](image-55.png)
+
+## 创建远程库别名
+git remote add test git@github.com:Al17er/test.git
+git -v 
+![alt text](image-56.png)
+
+## 推送代码
+git push 别名 分支
+
+![alt text](image-57.png)
+
+推送成功
+![alt text](image-58.png)
+
+## 拉取远程库到本地
+git pull 别名 分支
+
+![alt text](image-59.png)
+
+## 克隆远程代码
+git clone 地址
+
+![alt text](image-60.png)
+
+![alt text](image-61.png)
+
+## 修改后重新push
+
+git add ./
+git commit "remote edit"
+git push
+
+## fork
+- fork 用与把别人的代码复制一份到自己的仓库里。
+
+## pull request
+- 当自己仓库代码修改完成后，提交请求可以把修改内容推送到原作者仓库。
+
+## 配置ssh免密登录
+ssh-keygen -t rsa -C "邮箱地址"
+查看~/.ssh/id_rsa.pub文件内容
+最后在github上添加公钥
+
+![alt text](image-62.png)
+
+ssh -T git@github.com
+
+![alt text](image-63.png)
+
+- 出现这个内容代表配置成功！
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+## man
+- 用法：man + 命令
+- 用途：当我们不知道一个命令的使用方法可以使用man获取该命令的使用说明书。
+- 案例：man rm
+
+![alt text](image.png)
+
+## info
+- 用法：info + 命令
+- 用途: 获取命令帮助信息
+- 案例：info rm
+
+![alt text](image-1.png)
+
+## whatis
+- 用法：whatis + 命令
+- 用途: 获取命令帮助信息(精简版)
+- 案例：whatis man
+
+![alt text](image-2.png)
+
+## touch 
+- 用法: touch + 文件名
+- 用途: 创建文件
+- 案例: touch Al17er
+
+![alt text](image-3.png)
+
+## mkdir
+- 用法: mkdir + 目录名
+- 用途: 创建文件夹
+- 案例: mkdir Al17er
+
+![alt text](image-4.png)
+
+## rm
+- 用法: rm + 文件名
+- 用途: 删除文件或目录
+- 案例: rm -rf Al17er
+
+![alt text](image-5.png)
+
+
+## rmdir
+- 用法: rmdir + 目录名
+- 用途: 删除空目录
+- 案例: rmdir Al17er
+
+![alt text](image-6.png)
+
+## mv
+- 用法: mv 源文件 重命名后文件
+- 用途: 重命名文件或文件夹
+- 案例: mv test Al17er
+
+![alt text](image-7.png)
+
+## cp
+- 用法: cp 源文件 目的文件
+- 用途: 复制文件或文件夹
+- 案例: cp -r Al17er test
+
+![alt text](image-8.png)
+
+## cd 
+- 用法: cd 目录路径
+- 用途: 改变路径
+- 案例: cd Al17er
+
+![alt text](image-9.png)
+
+## pwd 
+- 用法: pwd
+- 用途: 查看当前所在路径
+- 案例: pwd
+
+![alt text](image-10.png)
+
+## ls
+- 用法: ls 目录路径
+- 用途: 列出目录文件
+- 案例: ls
+
+![alt text](image-11.png)
+
+## tree
+- 用法: tree
+- 用途: 查看目录结构
+- 案例: tree /opt
+
+![alt text](image-12.png)
+
+
+## stat
+- 用法: stat 文件名
+- 用途: 查看当前文件属性
+- 案例: stat test
+
+![alt text](image-13.png)
+
+## rename
+- 用法: rename 's/old/new/' files
+- 用途: 批量重命名文件
+- 案例: rename 's/h/a/' *.h
+
+![alt text](image-15.png)
+
+
+## basename
+- 用法: basename /path/to/somefile.txt
+- 用途: 从给定的文件名或路径中提取出基本文件名
+- 案例: basename 1.h .h
+
+![alt text](image-16.png)
+
+
+## dirname
+- 用法: dirname /root/move
+- 用途: 提取命令中的目录部分
+- 案例: dirname /root/move
+
+![alt text](image-17.png)
+
+## file
+- 用法: file 文件名
+- 用途: 判断文件类型
+- 案例: file /dev/sda
+
+ ![alt text](image-18.png)
+
+## md5sum 
+- 用法: md5sum 文件名
+- 用途: 计算文件md5值
+- 案例: md5sum 1.h
+
+![alt text](image-19.png)
+
+## find 
+- 用法: find 
+- 用途: 查找文件
+- 案例: find /root/ -name 1.h
+
+![alt text](image-20.png)
+
+## which
+- 用法: which + 命令
+- 用途: 搜索命令所在路径
+- 案例: which ls
+
+![alt text](image-21.png)
+
+
+## whereis
+- 用法: whereis + 命令
+- 用途: 定位命令所在文件
+- 案例: whereis ls
+
+![alt text](image-22.png)
+
+## locat 
+- 用法:locat string
+- 用途:快速查找包含指定字符的文件
+- 案例:locat 1.h
+
+![alt text](image-23.png)
+
+## chown 
+- 用法: chown 用户:组 文件
+- 用途: 改变文件或目录的所有者和组。
+- 案例: chown root:root 1.h
+
+![alt text](image-24.png)
+
+## chgrp
+- 用法: chgrp 组 文件
+- 用途: 改变文件或目录的所属组。
+- 案例: chgrp alter 1.h
+
+![alt text](image-25.png)
+
+## chmod
+- 用法: chmod 模式 文件
+- 用途: 改变文件或目录的访问权限。
+- 案例: chmod 755 1.h
+
+![alt text](image-26.png)
+
+## grep
+- 用法: grep string
+- 用途: 在文件中搜索与给定模式匹配的行，并将这些行打印到标准输出。
+- 案例: ls -l /etc |grep ssh
+
+![alt text](image-27.png)
+
+
+## egrep
+- 用法: egrep '正则' string
+- 用途: grep 的一个变体，它默认使用扩展正则表达式
+- 案例: ls -l /etc |egrep ssh
+
+![alt text](image-28.png)
+
+
+## cat
+- 用法: cat 文件名
+- 用途: 查看文件内容
+- 案例: cat 1.h
+
+![alt text](image-29.png)
+
+## more
+- 用法: more 文件
+- 用途: 按页显示文本内容
+- 案例: more 1.h
+
+![alt text](image-30.png)
+
+## less
+- 用法: less 文件
+- 用途: 分页展示文本内容
+- 案例: less 1.h
+
+![alt text](image-31.png)
+
+
+## head
+- 用法: head 文件名
+- 用途: 显示文件前几行
+- 案例: head -n 5 1.h
+
+![alt text](image-32.png)
+
+## tail 
+- 用法: tail 文件名
+- 用途: 显示文件后几行
+- 案例: tail -n 5 1.h
+
+![alt text](image-33.png)
+
+## tac
+- 用法: tac 文件名
+- 用途: 从后往前输出文本内容
+- 案例: tac 1.h
+
+![alt text](image-34.png)
+
+## nl
+- 用法: nl 文件名
+- 用途: 统计文本行数
+- 案例: nl 1.h
+
+![alt text](image-35.png)
+
+## wc
+- 用法: wc 文件名
+- 用途: 统计文件字数
+- 案例: wc 1.h
+
+![alt text](image-36.png)
+
+
+## splt
+- 用法: split 输入文件 输出文件
+- 用途: 将一个大文件分割成多个小文件。可以按行数、字节数或大小来分割文件。
+- 案例: split -l 3 1.h part1_
+
+![alt text](image-37.png)
+
+
+## cut
+- 用法: cut 文件名
+- 用途: 从文件的每一行中提取部分内容。可以基于字符、字段或字节来选择要提取的部分。
+- 案例: cut -c1-5 1.h
+
+![alt text](image-38.png)
+
+## paste
+- 用法: paste 文件1 文件2
+- 用途: 将多个文件的内容按行合并，并使用制表符或其他指定的分隔符进行分隔。
+- 案例: paste -d '|' 1.h 2.h
+
+![alt text](image-39.png)
+
+
+## groupadd
+- 用法: groupadd 组名称
+- 用途: 添加用户组
+- 案例: groupadd test
+
+![alt text](image-40.png)
+
+
+## groupdel
+- 用法: groupdel 组名称
+- 用途: 删除用户组
+- 案例: groupdel test
+
+![alt text](image-41.png)
+
+## sort
+- 用法: sort 文件名
+- 用途: 对文本文件中的行进行排序。默认升序。
+- 案例: sort 1.h
+
+![alt text](image-42.png)
+
+
+## unip
+- 用法: uniq 文件名
+- 用途: 去重复
+- 案例: uniq 1.h
+
+![alt text](image-43.png)
+
+## diff 
+- 用法: diff 文件1 文件2
+- 用途: 比较2个文件差异
+- 案例: diff 1.h 2.h
+
+![alt text](image-44.png)
+
+
+## patch
+- 用法: patch 原文件 < 补丁文件
+- 用途: 根据 diff 生成的补丁文件对文件进行修改。patch 可以应用或回滚文件的变化。
+- 案例: 这个命令用不到，有请下一位
+
+## join
+- 用法: join 文件1 文件2
+- 用途: 将两个文件基于共同字段（通常是第一列）进行连接，并输出匹配的行。
+- 案例: join 1.h 2.h
+
+![alt text](image-45.png)
+
+## tr 
+- 用法: tr 字符集1 字符集2
+- 用途: 用于字符的转换或删除。tr 可以将一组字符转换为另一组字符，或者删除某些字符。
+- 案例: tr '[:lower:]' '[:upper:]' < 1.h
+
+![alt text](image-46.png)
+
+
+## sed
+- 用法: sed '正则' 文件
+- 用途: 用于对输入流（文件或管道）进行基本的文本转换。
+- 案例: sed '1,5d' 1.h
+
+![alt text](image-47.png)
+
+## awk
+- 用法: awk '正则' 文件名
+- 用途: 处理文本文件中的数据，进行复杂的模式匹配、字段操作、数学运算等。
+- 案例: awk -F, '{print $1}' 1.h
+
+![alt text](image-48.png)
+
+
+## usermod
+- 用法: usermod 用户名
+- 用途: 用于修改现有用户的属性。可以更改用户的登录名、主目录、默认 shell、用户组等。
+- 案例: usermod -l haha heihei
+
+![alt text](image-49.png)
+
+
+## groups
+- 用法: groups 用户名
+- 用途: 显示一个或多个用户所属的所有组
+- 案例: groups root
+
+![alt text](image-50.png)
+
+
+## awk
+- 用法: awk '正则' 文件名
+- 用途: 处理文本文件中的数据，进行复杂的模式匹配、字段操作、数学运算等。
+- 案例: awk '{print $1}' 1.h
+
+![alt text](image-51.png)
+
+
+## du
+- 用法: du 文件|目录
+- 用途: 显示文件和目录的磁盘使用情况。
+- 案例: du -h 1.h
+
+![alt text](image-52.png)
+
+
+## df
+- 用法: df 文件系统
+- 用途: 显示文件系统的磁盘空间使用情况。
+- 案例: df -h /root
+
+![alt text](image-53.png)
+
+
+## sync
+- 用法: sync
+- 用途: 将内存中的所有未写入数据（脏页）同步到磁盘。
+- 案例: sync
+
+![alt text](image-54.png)
+
+## mount
+- 用法: mount 磁盘 挂载目录
+- 用途: 挂载磁盘
+- 案例: mount /dev/sda /opt
+
+## umount
+- 用法: umount 挂载目录
+- 用途: 取消挂载
+- 案例: umount /opt
+
+## dd
+- 用法: dd
+- 用途: 用于从一个文件或设备复制数据到另一个文件或设备。
+- 案例: dd if=1.h of=dd.h
+
+![alt text](image-55.png)
+
+## tar
+- 用法: tar 压缩包
+- 用途: 解压或压缩文件
+- 案例: tar -cvf 11.tar 1.h
+
+![alt text](image-56.png)
+
+
+## zip_unzip
+- 用法: zip|unzip 压缩包名
+- 用途: 解压或压缩文件
+- 案例: unzip 1.zip
+
+![alt text](image-57.png)
+
+
+## gzip_gunzip
+- 用法: gzip|gunzip 压缩包名
+- 用途: 解压或压缩文件
+- 案例: gzip 1.h
+
+![alt text](image-58.png)
+
+
+## uname
+- 用法: uname 
+- 用途: 查看系统信息
+- 案例: uname -a
+
+![alt text](image-59.png)
+
+
+## hostname
+- 用法:hostname
+- 用途:查看主机名
+- 案例: hostname
+
+![alt text](image-60.png)
+
+## dmesg
+- 用法: dmesg
+- 用途: 显示或控制内核环形缓冲区中的消息。
+- 案例: dmesg
+
+![alt text](image-61.png)
+
+
+## 
+- 用法:uptime
+- 用途:查看系统资源使用情况
+- 案例:uptime
+
+![alt text](image-62.png)
+
+
+## free
+- 用法: free
+- 用途: 查看内存使用情况
+- 案例: free -m
+
+![alt text](image-63.png)
+
+
+## ulimit
+- 用法: ulimit
+- 用途: 用于控制 shell 启动进程可用的系统资源。
+- 案例: 这个命令可不敢随便用，有请下一位。
+
+## init
+- 用法: init 3|5|6|0
+- 用途: 切换系统运行级别
+- 案例: 0：关机 3：图形 5:最小化 6:重启
+
+## service
+- 用法: service 服务名 指令
+- 用途: 操作系统服务运行
+- 案例: service frpc status
+
+![alt text](image-64.png)
+
+
+## vmstat
+- 用法: vmstat
+- 用途: 显示虚拟内存状态
+- 案例: vmstat
+
+![alt text](image-65.png)
+
+
+## iostat
+- 用法: iostat
+- 用途: 监视系统输入输出设备和CPU的使用情况命令
+- 案例: iostat
+
+![alt text](image-66.png)
+
+
+## ipcs
+- 用法: ipcs
+- 用途: 显示进程间通信设备状态命令
+- 案例: ipcs
+
+![alt text](image-67.png)
+
+
+## ipcrm
+- 用法: ipcrm
+- 用途: 删除指定ipc资源
+- 案例: 这个命令可不敢乱删，有请下一位。
+
+## route
+- 用法: route
+- 用途: 查看路由表
+- 案例: route
+
+![alt text](image-68.png)
+
+## ping
+- 用法: ping ip
+- 用途: 测试icmp
+- 案例: ping www.baidu.com
+
+![alt text](image-69.png)
+
+
+## traceroute
+- 用法: traceroute ip
+- 用途: 路由追踪，用于网络排错。
+- 案例: traceroute www.baidu.com
+
+![alt text](image-70.png)
+
+## ifconfig
+- 用法: ifconfig
+- 用途: 查看本机网络配置。
+- 案例: ifconfig
+
+![alt text](image-71.png)
+
+
+## ifup
+- 用法: ifup 接口
+- 用途: 启用网络接口
+- 案例: ifup eth0
+
+## ifdown
+- 用法: ifdown 接口
+- 用途: 关闭网络接口
+- 案例: ifdown eth0
+
+## netstat
+- 用法: netstat 
+- 用途: 查看端口开放情况
+- 案例: netstat -ano
+
+![alt text](image-72.png)
+
+
+## ss
+- 用法: ss
+- 用途: 显示活动套接字信息命令
+- 案例: ss
+
+![alt text](image-73.png)
+
+## telnet
+- 用法: telnet ip
+- 用途: 远程连接服务器，常用来测试端口开放情况
+- 案例: telnet www.baidu.com 80
+
+![alt text](image-74.png)
+
+
+## ssh
+- 用法: ssh 用户名@ip
+- 用途: 远程登录服务器
+- 案例: ssh root@127.0.0.1:3223
+
+![alt text](image-75.png)
+
+
+## ftp
+- 用法: ftp ip
+- 用途: 连接目标ftp服务
+- 案例: ftp 127.0.0.1
+
+![alt text](image-76.png)
+
+
+## sftp
+- 用法: sftp ip
+- 用途: 加密文件传输
+- 案例: 使用crt连接
+
+![alt text](image-77.png)
+
+
+## lftp
+- 用法: lftp ftp://用户名:密码@ftp.xx.com
+- 用途: 功能强大的文件传输程序
+- 案例: 不常用，了解即可。
+
+## wget
+- 用法: wget + url地址
+- 用途: 下载文件到本地。
+- 案例: wget www.baidu.com
+
+![alt text](image-78.png)
+
+
+## scp
+- 用法: scp 源文件 目标文件
+- 用途: 远程拷贝文件
+- 案例: 不常用命令。
+
+## curl
+- 用法: curl url
+- 用途: 向目标地址发起http请求。
+- 案例: curl www.baidu.com
+
+![alt text](image-79.png)
+
+
+## host
+- 用法: host 域名
+- 用途: 用于执行 DNS 查询的命令行工具。可以用来查询域名.
+- 案例: host www.baidu.com 114.114.114.114
+
+![alt text](image-80.png)
+
+
+## tcpdump
+- 用法: tcpdump
+- 用途: 抓包网络请求数据包。
+- 案例: tcpdump -i wlp2s0
+
+![alt text](image-81.png)
+
+
+## nc
+- 用法: nc 主机 端口
+- 用途: 常用于创建 TCP 或 UDP 连接，监听端口，传输文件，进行端口扫描等。
+- 案例: nc -l -p 1233
+
+![alt text](image-82.png)
+
+
+## useradd
+- 用法: useradd 用户名
+- 用途: 添加用户
+- 案例: useradd test
+
+![alt text](image-83.png)
+
+
+## adduser
+- 用法: adder 用户名
+- 用途: 创建用户
+- 案例: adduser test123
+
+![alt text](image-84.png)
+
+
+## passwd
+- 用法: passwd 用户名
+- 用途: 为用户添加或修改密码
+- 案例: passwd test
+
+![alt text](image-85.png)
+
+
+## userdel
+- 用法: userdel 用户名
+- 用途: 删除用户
+- 案例: userdel test
+
+![alt text](image-86.png)
+
+
+## su
+- 用法: su 用户名
+- 用途: 切换用户
+- 案例: su alter
+
+![alt text](image-87.png)
+
+
+## sudo
+- 用法: sudo 命令
+- 用途: 以超级用户权限执行命令
+- 案例: sudo whereis ls
+
+![alt text](image-88.png)
+
+## id
+- 用法: id
+- 用途: 查看当前用户信息
+- 案例: id
+
+![alt text](image-89.png)
+
+
+## whoami
+- 用法: whoami
+- 用途: 查看当前登录用户
+- 案例: whoami
+
+![alt text](image-90.png)
+
+## who
+- 用法: who
+- 用途: 查看当前在线用户
+- 案例: who
+
+![alt text](image-91.png)
+
+
+
+## w
+- 用法: w
+- 用途: 查看当前在线用户
+- 案例: w
+
+![alt text](image-92.png)
+
+
+## last
+- 用法: last
+- 用途: 显示最近登录用户日志
+- 案例: last
+
+![alt text](image-93.png)
+
+
+## users
+- 用法:users
+- 用途: 查看当前用户信息
+- 案例: users
+
+![alt text](image-94.png)
+
+## top
+- 用法: top
+- 用途: 查看系统资源占用情况
+- 案例: top
+
+![alt text](image-95.png)
+
+
+## ps
+- 用法: ps 
+- 用途: 查看当前系统运行进程信息
+- 案例: ps -ef
+
+![alt text](image-96.png)
+
+## pstree
+- 用法: pstree
+- 用途: 以进程树方式显示当前系统运行进程。
+- 案例: pstree
+
+![alt text](image-97.png)
+
+## pgrep
+- 用法: pgrep 进程名
+- 用途: 获取当前进程id
+- 案例: pgrep frp
+
+![alt text](image-98.png)
+
+
+## lsof
+- 用法:lsof
+- 用途: 列出所有进程打开的文件
+- 案例: lsof
+
+![alt text](image-99.png)
+
+## jobs
+- 用法:jobs
+- 用途:查看后台进程
+- 案例:jobs
+
+![alt text](image-100.png)
+
+
+## bg
+- 用法: bg
+- 用途: 将前台进程转至后台运行
+- 案例: bg
+
+## fg
+- 用法: fg
+- 用途: 将后台进程转至前台运行
+- 案例: fg
+
+## kill
+- 用法:kill 进程名
+- 用途:关闭进程
+- 案例:kill -9 frp
+
+## killall
+- 用法: killall 进程名
+- 用途: 关闭所有同进程名的进程
+- 案例: killall -9 frp
+
+## nice
+- 用法: nice 命令
+- 用途: 用于启动一个新进程，并为其设置一个不同的调度优先级。
+- 案例: nice free
+
+![alt text](image-101.png)
+
+## renice
+- 用法: renice 优先级 进程号
+- 用途: 用于改变已运行进程的调度优先级。
+- 案例: renice 5 -p 2981
+
+## nohup
+- 用法: nohup 命令
+- 用途: 运行命令并挂在后台
+- 案例: nohup ls
+
+![alt text](image-102.png)
+
+## apt
+- 用法: apt 操作 报包
+- 用途: 包管理器
+- 案例: apt install vim
+
+![alt text](image-103.png)
+
+
+## apt-get 
+- 用法: apt-get 操作 包名
+- 用途: 包管理器，apt的全命令
+- 案例: apt-get install vim
+
+![alt text](image-104.png)
+
+
+## export
+- 用法:export 变量名
+- 用途:用于设置环境变量
+- 案例:export aaa=123
+
+![alt text](image-105.png)
+
+
+## source
+- 用法:source 文件
+- 用途:立即加载文件变量
+- 案例:source ~/.cargo/env
+
+![alt text](image-106.png)
+
+
+## set|unset
+- 用法:set|unset 变量名=123
+- 用途:设置或取消环境变量
+- 案例:set aaa=123 | unset aaa
+
+![alt text](image-107.png)
+
+
+## echo
+- 用法:echo string
+- 用途:输出文本
+- 案例:echo "123"
+
+![alt text](image-108.png)
+
+
+## printf
+- 用法: printf string
+- 用途: 不接换行符打印文本
+- 案例: printf aaaa
+
+![alt text](image-109.png)
+
+
+## clear
+- 用法: clear
+- 用途: 清屏
+- 案例: clear
+
+![alt text](image-110.png)
+
+
+## history
+- 用法: history
+- 用途: 查看历史记录
+- 案例: history
+
+![alt text](image-111.png)
+
+
+
+## login_logout
+- 用法:login_logout
+- 用途:登录|登出
+
+## exit
+- 用法: exit
+- 用途: 退出并关闭终端
+
+## xargs
+- 用法: xargs 命令
+- 用途: 强大的命令行工具，用于从标准输入构建和执行命令。
+- 案例: ls | xargs echo 
+
+![alt text](image-112.png)
+
+## exec
+- 用法: exec 命令
+- 用途: 执行完当前命令后关闭终端
+- 案例: exec ls
+
+![alt text](image-113.png)
+
+
+## alias_unalias
+- 用法: alias_unalias 别名="执行操作"
+- 用途: 设置别名操作命令
+- 案例: alias lp="ls -l"
+
+![alt text](image-114.png)
+
+
+## type
+- 用法: type 命令
+- 用途: 用于显示给定命令的类型。它可以告诉你一个命令是内置命令、外部命令（可执行文件）、函数还是别名。
+- 案例: type ls
+
+![alt text](image-115.png)
+
+## date
+- 用法:date
+- 用途:显示时间
+- 案例:date
+
+![alt text](image-116.png)
+
+
+## cal 
+- 用法: cal 日期
+- 用途: 命令用于显示当前月份的日历或指定月份/年份的日历。
+- 案例: ubuntu未找到该命令
+
+## crontab
+- 用法:crontab 
+- 用途: 设置定时任务
+- 案例: crontab -l
+
+![alt text](image-117.png)
+
+
+## at
+- 用法: at 时间
+- 用途: 设置一次性计划任务
+- 案例: echo "echo Hello, World!" | at now + 1 minutes
+
+![alt text](image-118.png)
+
+
+## atq
+- 用法: atq
+- 用途: 列出所有已安排的任务。
+- 案例: atq
+
+![alt text](image-119.png)
+
+ 
+## atrm
+- 用法: atrm 任务号
+- 用途: 用于删除已安排的 at 任务。
+- 案例: atrm 2
+
+![alt text](image-120.png)
+
+
+## time 
+- 用法: time 命令
+- 用途: 测量命令执行时间
+- 案例: time ls
+
+![alt text](image-121.png)
+
+
+## watch
+- 用法: watch 命令
+- 用途: 每隔一段时间执行一次命令
+- 案例: watch -n 2 ls
+
+![alt text](image-122.png)
+
+
+## bc 
+- 用法: bc 
+- 用途: 任意精度计算器语言。它可以处理非常大的数字，并且支持基本的算术运算、变量定义、条件语句等。
+- 案例: echo "2 + 2" | bc
+
+![alt text](image-123.png)
+
+
+## ln
+- 用法: ln 源文件 目的路径
+- 用途: 创建软连接
+- 案例: ln -s 1.h 9.h
+
+![alt text](image-124.png)
+
+## shutdown
+- 用法: shutdown
+- 用途: 关机
+
+
+## halt
+- 用法: halt
+- 用途: 用于关闭系统。它会停止所有运行中的进程，并将系统置于一个可以安全断电的状态。
+
+## poweroff
+- 用法: poweroff
+- 用途: 关机
+
+## reboot
+- 用法: reboot
+- 用途: 重启
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