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告别Linux命令迷茫!5大类12核心命令,搞定90%日常运维

  • 2026-03-28 15:43:47
告别Linux命令迷茫!5大类12核心命令,搞定90%日常运维

作为Linux新手,你是不是也有这样的困扰:面对成百上千的命令无从下手,记了又忘,输错命令还怕搞崩系统,越学越没方向?

其实学Linux命令根本不用死记硬背!今天就把最核心的5大类12个高频命令拆解清楚,结合实操场景教你用,练3天就能应对日常运维90%的需求,剩下的用到时再查就行~

一、先避坑:新手学命令的3个核心原则

  1. 1. 不贪多:聚焦核心命令,拒绝“全量记忆”,先解决高频场景
  2. 2. 慎操作:高危命令执行前务必确认,重要文件先备份
  3. 3. 重实操:每天练10分钟,比死记手册管用10倍

二、5大类核心命令(附高频用法)

1. 文件与目录操作(7个)

日常最常用的基础命令,搞定文件/文件夹的所有操作:

  • • ls:列目录内容✅ 常用:ls -l(简写ll,看文件权限/大小/修改时间)、ls -a(显示隐藏文件)
  • • cd:切换目录✅ 常用:cd ~(回家目录)、cd ..(上一级)、cd -(回到上一次目录)
  • • mkdir:创建目录✅ 常用:mkdir -p /a/b/c(一键创建多级目录)
  • • rm:删除文件/目录(⚠️ 高危)✅ 常用:rm 文件名(删文件)、rm -r 目录名(删目录)❌ 绝对禁止:rm -rf /(删光系统所有文件)
  • • cp:复制✅ 常用:cp -r 原目录 目标路径(复制目录必须加-r
  • • mv:移动/重命名✅ 常用:mv 旧名 新名(重命名)、mv 原文件 目标路径(移动目录不用-r
  • • pwd:查看当前目录完整路径

2. 文本处理(4个)

查日志、改配置文件必备:

  • • cat:查看小文件内容✅ 常用:cat -n 文件名(显示行号,查配置超方便)
  • • grep:文本搜索✅ 常用:grep -in 关键词 文件名-i忽略大小写,-n显行号,排查日志必用)
  • • tail:查看文件末尾✅ 常用:tail -n 10 日志名(看最后10行)、tail -f 日志名(实时监控,Ctrl+c退出)
  • • vi/vim:编辑文本✅ 操作步骤:① vim 文件名(打开/创建文件)② 按i进入编辑模式③ 按ESC退出编辑,:wq保存退出/:q!不保存强制退出

3. 系统管理(5个)

监控系统状态、管理进程:

  • • top:实时看系统性能(CPU/内存/进程)✅ 常用:按p按CPU排序、m按内存排序、q退出
  • • free:查看内存使用✅ 常用:free -h(人性化显示K/M/G单位)
  • • df:查看磁盘使用✅ 常用:df -h(看磁盘使用率,超90%要及时清理)
  • • ps:查看进程✅ 常用:ps -ef | grep 进程名(查指定进程是否运行)
  • • kill:终止进程(⚠️ 高危)✅ 常用:kill 进程PID(正常终止)、kill -9 进程PID(强制终止)❌ 禁止:杀PID为1的系统核心进程

4. 网络管理(4个)

排查网络、远程连接必备:

  • • ping:测试网络连通性✅ 常用:ping 目标IP/域名(看丢包率,Ctrl+c退出)
  • • ifconfig/ip:查看网卡信息✅ 常用:ip addr(主流系统替代ifconfig,查IP地址)
  • • ssh:远程连接服务器✅ 常用:ssh 用户名@目标IP(远程运维核心命令)

5. 用户与权限(4个)

规范操作,避免权限踩坑:

  • • useradd:创建普通用户✅ 常用:useradd 用户名(不建议长期用root)
  • • passwd:设置密码✅ 常用:passwd 用户名(输入两次密码,不显示)
  • • su:切换用户✅ 常用:su - root(普通用户切root,需输密码)、su - 用户名(root切普通用户,免密码)
  • • chmod:修改文件权限✅ 核心:记住数字权限(r=4、w=2、x=1)✅ 常用:chmod 755 文件名(脚本/普通文件常用权限)

三、新手必看:4个避坑要点

  1. 1. 高危命令(rm -rf /kill -9 1)绝对别乱输,执行前先确认路径/进程
  2. 2. 区分绝对路径(以/开头)和相对路径,避免操作错文件
  3. 3. 命令报错先排查:
    • • command not found:检查拼写/命令路径
    • • permission denied:切换用户或用sudo提权
  4. 4. 不用死记硬背,每天实操10分钟,3天就能熟练用核心命令

总结

  1. 1. 学Linux命令不用贪多,掌握5大类核心命令就能应对90%日常运维场景;
  2. 2. 重点关注高危命令(rmkill)的使用规范,避免操作失误;
  3. 3. 实操是掌握命令的核心,每天10分钟比死记手册更有效。

如果觉得这篇内容有用,记得收藏+转发,下次用Linux命令时直接翻出来看~

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  1. CONNECT:[ UseTime:0.000465s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000625s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.010419s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.010003s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000603s ]
  6. SELECT * FROM `set` [ RunTime:0.008792s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000775s ]
  8. SELECT * FROM `article` WHERE `id` = 483593 LIMIT 1 [ RunTime:0.018425s ]
  9. UPDATE `article` SET `lasttime` = 1774699140 WHERE `id` = 483593 [ RunTime:0.000825s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.014568s ]
  11. SELECT * FROM `article` WHERE `id` < 483593 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.054547s ]
  12. SELECT * FROM `article` WHERE `id` > 483593 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.014846s ]
  13. SELECT * FROM `article` WHERE `id` < 483593 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.167876s ]
  14. SELECT * FROM `article` WHERE `id` < 483593 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.140258s ]
  15. SELECT * FROM `article` WHERE `id` < 483593 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.271921s ]
0.790267s