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Linux 高频常识陷阱

  • 2026-06-29 09:47:00
Linux 高频常识陷阱
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Linux 高频常识陷阱

世界上有很多默认你 “应该早就知道”的 “常识陷阱”。

下面这 30 条就是 Linux 中 最高频的20% 的常识陷阱:

一、SSH / 远程(最高频)

  1. 远程运行 sudo 必须用 ssh -t,否则根据报错只能用sudo -S输入明文密码
  2. SSH 密钥不生效,99% 是权限问题(~/.ssh 必须 700,密钥 600)
  3. SSH 连接很慢,是因为 DNS 反向解析,关闭 UseDNS no 秒连
  4. scp 不识别 ~、别名、bashrc 环境,路径必须写绝对路径

二、sudo / 权限

  1. sudo 会重置环境变量,所以有些命令普通用户能用,sudo 反而找不到
  2. 普通用户能写的文件/目录,sudo 反而不能(SELinux / 属主 / 上下文)
  3. 脚本里不能交互式输密码,要么免密、要么 ssh -t、要么 expect

三、文件 / 路径 / 通配符

  1. 运行当前目录脚本必须 ./script,直接写文件名找不到
  2. rm -rf /* 和 rm -rf ./* 差一个点,就是删系统 vs 删当前目录
  3. 文件名带空格、特殊符号必须加引号或转义,否则命令直接乱套
  4. 软链接只是“快捷方式”,删掉原文件链接直接失效

四、文本 / 编码 / 换行

  1. Windows 编辑过的脚本在 Linux 报错 command not found,是 ^M 换行符问题
  2. 复制粘贴带来看不见的空白字符(零宽空格等),导致语法神秘报错
  3. 肉眼看着一样的字符,grep 匹配不上,往往是不可见 Unicode

五、进程 / 后台 / 输出

  1. 终端一关进程就没,必须用 nohup / screen / tmux 脱离会话
  2. 命令输出大量内容到终端会巨慢,重定向到文件立刻变快
  3. 只加 & 后台不够,输入还绑在终端,容易暂停,要用 &>/dev/null &

六、网络 / 端口 / 防火墙

  1. 服务启动了但外部连不上,大概率是防火墙没放行端口或云平台安全组没开
  2. 服务监听 127.0.0.1,外部永远访问不了,必须改成 0.0.0.0
  3. 本机 curl 正常,浏览器/别的机器不行,是 DNS、代理或 hosts 问题

七、系统 / 磁盘 / 资源

  1. 磁盘显示满了,但 du 找不到大文件,是删除文件被进程占用未释放
  2. Linux 内存占满不一定是泄漏,大部分是 cache/buffer 正常占用
  3. 时区不对会导致日志时间错乱、定时任务不执行
  4. crontab 不加载用户环境,手动能跑的命令,定时任务经常失败

八、命令行行为

  1. 管道左边出错,右边依然继续执行,不会自动中断
  2. 单引号不解析变量,双引号解析,写脚本必踩
  3. # 在命令行里不一定是注释,放后面可能被当作参数
  4. Linux 严格大小写敏感,文件名、命令、配置项都区分

九、包管理 / 软件安装

  1. 安装完工具提示“command not found”,是 PATH 未刷新,需重新登录
  2. 很多常用软件不在默认源里,需要先装 EPEL 等扩展仓库

为什么会有这些常识陷阱

  • 报错信息不会告诉你真正原因,只会告诉你关于它自身的现象
  • 根据 UNIX 哲学,工具不会教你怎么用它,只会告诉你它“不开心”
  • 老手所谓的“常识”,全是踩过的坑,但他们忘记了踩坑这件事
  • 90% 的难题不是技术,是“没人告诉你,你就永远不会知道”
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  1. CONNECT:[ UseTime:0.000604s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000794s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.006046s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000448s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000570s ]
  6. SELECT * FROM `set` [ RunTime:0.000262s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000550s ]
  8. SELECT * FROM `article` WHERE `id` = 487505 LIMIT 1 [ RunTime:0.001449s ]
  9. UPDATE `article` SET `lasttime` = 1783053304 WHERE `id` = 487505 [ RunTime:0.055545s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000339s ]
  11. SELECT * FROM `article` WHERE `id` < 487505 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.006670s ]
  12. SELECT * FROM `article` WHERE `id` > 487505 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001212s ]
  13. SELECT * FROM `article` WHERE `id` < 487505 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.055455s ]
  14. SELECT * FROM `article` WHERE `id` < 487505 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.004481s ]
  15. SELECT * FROM `article` WHERE `id` < 487505 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.028497s ]
0.233665s