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趣话Linux Command①:一种极致的程序员浪漫

  • 2026-02-07 09:21:10
趣话Linux Command①:一种极致的程序员浪漫

Application 层:很多命令名字,

其实是“历史遗留缩写

ls —— 为什么不是 list

  • 来源:1970 年代,UNIX 运行在 打孔卡 / 电传终端 上

  •  原因:输入字符是“昂贵的”, Ken Thompson 强烈偏好短命令

  •  结果:

ls = list segments / list directory  同时代的还有:cp、mv、rm

  •  影响至今:

  • Linux 命令“短而怪”,但组合能力极强  这是 UNIX 哲学的第一代烙印:少打字,多组合

80列、矩形孔的标准的IBM打孔卡片,已经打孔表示了字符集。此类型用于存储数据。


grep —— 真的是从“正则表达式”里来的

 全称来自早期编辑器 ed 的命令:  g/re/

global

regular expression

print  后来被独立做成一个程序,就叫 grep,所以:   ps aux | grep ssh   本质上是在做 “全局正则打印” 

  • 这是为什么:

egrep / fgrep 曾经存在  GNU 后来统一为 grep -E / -F 


vi / vim —— “不是为了新手设计的”

 vi = visual editor

  •  设计背景:终端没有方向键,没有鼠标,所以: 

 h j k l 用来移动  模式化(normal / insert)是为了 减少按键数

vim = Vi IMproved,90 年代 Bram Moolenaar 扩展,但仍然保留向后兼容

这也是为什么:

  •  vi 学习曲线陡 

  •  但熟练后效率极高 

  •  今天还能在 initramfs、救援系统里用


tar —— 真的是“磁带时代产物”

tar = tape archive

 原始用途:把文件顺序写入 磁带,所以:

 没有随机访问,不能“删除某个文件再压缩” 

 为什么参数看起来反人类? 

tar xvf file.tar     因为最早 没有 -    这也是为什么 tar + gzip 是两步:   tar cf - dir | gzip > dir.tar.gz 

学生时代风靡校园的磁带机


System Call 层:命令“消失了”,只剩下动词

fork —— UNIX 最天才也最怪的设计

 fork():复制当前进程,返回两次(父进程 / 子进程)

历史原因:UNIX 作者不想设计复杂的“进程创建 API” , 结果: 

pid = fork(); if (pid == 0) {     execve(...); } 

优点:

  •  极其灵活 

代价: 

  •  初学者完全看不懂 

  •  Windows 至今没有真正的 fork


execve —— 为什么不叫 run

exec = execute

 特点:不创建新进程,直接“替换当前进程映像”

 所以 shell:先 fork,子进程 exec

 这也是为什么:  ps   看不到 shell 调用过的命令进程残留

fork + exec 是 Linux 进程模型的核心信仰


ioctl —— 工程师最后的“垃圾桶”

ioctl = I/O control

 设计初衷: 给驱动一个“兜底接口”  现实: 

  • 网卡 

  •  摄像头 

  •  串口 

  •  V4L2 

 后果: 

  • 参数五花八门 

  •  强类型彻底崩坏 

 你在驱动里看到的: 

 _IOR('V', 1, struct xxx)   基本都是 ioctl


Kernel 层:为什么“看不到 command”

内核层“没有 command”是刻意设计

Kernel 不提供:

  • ls

  • ps

 只提供:

  •  数据结构 

  •  系统调用 

 好处:

  •  内核保持最小 

  •  用户空间自由演进 

 所以:

    ps 实际是 读 /proc

    ls 是 readdir() + stat()


    一个“串起来”的真实故事

    当你敲:ls | grep txt

    实际发生的是:

    1. shell fork

    2.  子进程 execve(ls)

    3. ls:   

       open(".")   

      getdents()   

    4. 输出写入 pipe 

    5. grep 再 fork + exec

    6. grep 调用 read

    7.  内核调度、复制数据、返回用户态 

    这一整套机制,50 年来几乎没变。

    参考文献

    CTR census machine - 打孔卡 - 维基百科,自由的百科全书

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    1. CONNECT:[ UseTime:0.000576s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
    2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000736s ]
    3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000325s ]
    4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000262s ]
    5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000593s ]
    6. SELECT * FROM `set` [ RunTime:0.000208s ]
    7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000680s ]
    8. SELECT * FROM `article` WHERE `id` = 467539 LIMIT 1 [ RunTime:0.000957s ]
    9. UPDATE `article` SET `lasttime` = 1770479606 WHERE `id` = 467539 [ RunTime:0.006960s ]
    10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000289s ]
    11. SELECT * FROM `article` WHERE `id` < 467539 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000385s ]
    12. SELECT * FROM `article` WHERE `id` > 467539 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000461s ]
    13. SELECT * FROM `article` WHERE `id` < 467539 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001865s ]
    14. SELECT * FROM `article` WHERE `id` < 467539 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.016651s ]
    15. SELECT * FROM `article` WHERE `id` < 467539 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.005679s ]
    0.105436s