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没有扩展名,Linux 如何决定一个文件能否运行?由谁运行?

  • 2026-01-04 06:39:59
没有扩展名,Linux 如何决定一个文件能否运行?由谁运行?

在 Windows 里,如果你把 game.exe 改名为 game.txt,双击它只会打开记事本,程序无法运行。因为 Windows 极其依赖后缀名来判断文件类型。

但在 Linux 世界,文件名真的只是一个名字。你可以把 Python 脚本命名为 script.png,只要设置正确,它依然能正常运行。文件扩展名在 Linux 主要是为了方便人类管理和区分,系统本身根本不在乎。

那么,Linux 究竟靠什么来判断一个文件能不能跑、该怎么跑?这取决于它内部的一套判定流程。

1. 找文件 (Shell)

这一步取决于输入命令的方式。

只输入命令名

输入 python 或 ls 时,Shell 不知道文件在哪里。它需要按顺序查找:

  1. 1. 别名:检查是否是用户定义的别名。
  2. 2. 内建命令:检查是否是 Shell 自带的功能,如 cd
  3. 3. 环境变量:扫描 $PATH 变量中的目录,直到找到同名文件。

输入具体路径

输入 ./script.sh 或 /bin/ls 时,已经指定了位置,Shell 跳过查找,直接把路径交给系统。


2. 查权限 (文件系统)

找到文件后,内核会先检查 x (Execute) 权限位。

如果不具备这个权限,系统直接报错 Permission denied,内核不会读取文件内容。必须使用 chmod +x 命令开启权限后才能继续。


3. 识别格式 (内核)

权限检查通过后,Linux 内核读取文件开头的数据(魔数字),决定由谁来执行。

二进制程序 (ELF)

文件开头是 7F 45 4C 46内核直接加载代码并运行。这是 Linux 最主要的可执行格式,支持代码直接编译在内核核心中。

Window 中的 exe等文件也有魔术字,但文字扩展名改了系统不会去看魔术字。

特定格式的文件也有魔术字,如JPEGPDF、Java 的 class等。

但系统默认只处理它认识的。

查看/boot/config-$(uname -r)中的配置

# Executable file formats#CONFIG_BINFMT_ELF=yCONFIG_COMPAT_BINFMT_ELF=yCONFIG_ELFCORE=yCONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS=yCONFIG_BINFMT_SCRIPT=yCONFIG_BINFMT_MISC=mCONFIG_COREDUMP=y# end of Executable file formats

说明:

  • • CONFIG_BINFMT_ELF=yy 代表内置。ELF 支持直接写在内核代码里,无法卸载。
  • • CONFIG_BINFMT_SCRIPT=y:脚本支持也是内置的。
  • • CONFIG_BINFMT_MISC=mm 代表模块。这是扩展功能,需要时才加载,用 lsmod 能看到。

脚本文件 (Shebang)

文件开头是 #!,对应的十六进制是 23 21内核读取 #! 后面的路径,启动对应的解释器(如 /bin/bash),把脚本作为参数传给它。

可以用 file 命令测试下修改 Shebang 的效果。

me@T420:~$ vim test.shme@T420:~$ cat test.shcd ..me@T420:~$ file test.shtest.sh: ASCII textme@T420:~$me@T420:~$ vim test.shme@T420:~$ cat test.sh#!/usr/bin/python3cd ..me@T420:~$ file test.shtest.sh: Python script, ASCII text executableme@T420:~$me@T420:~$ vim test.shme@T420:~$ cat test.sh#!/usr/bin/bashcd ..me@T420:~$ file test.shtest.sh: Bourne-Again shell script, ASCII text executable

自定义格式 (binfmt_misc)

文件既不是 ELF 也不是脚本,例如 Java 的 .class

内核会去查 /proc/sys/fs/binfmt_misc 中注册的规则。

如果匹配到对应的魔数,就调用预设的外部程序。


简单总结执行流程

顺序
阶段
负责对象
动作
1定位
Shell
确定文件路径
2安检
文件系统
检查 x 权限
3识别
内核
读取文件头魔数
4执行
内核或解释器
加载代码或启动解释器

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  1. CONNECT:[ UseTime:0.000427s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000583s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000277s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000260s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000471s ]
  6. SELECT * FROM `set` [ RunTime:0.000185s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000566s ]
  8. SELECT * FROM `article` WHERE `id` = 459455 LIMIT 1 [ RunTime:0.000539s ]
  9. UPDATE `article` SET `lasttime` = 1770598781 WHERE `id` = 459455 [ RunTime:0.003738s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.002484s ]
  11. SELECT * FROM `article` WHERE `id` < 459455 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001437s ]
  12. SELECT * FROM `article` WHERE `id` > 459455 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.004928s ]
  13. SELECT * FROM `article` WHERE `id` < 459455 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.003122s ]
  14. SELECT * FROM `article` WHERE `id` < 459455 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001232s ]
  15. SELECT * FROM `article` WHERE `id` < 459455 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002205s ]
0.090618s