我只是好奇是什么决定了所安装文件的文件权限apt。
运行apt download transmission然后dpkg -c transmission-daemon_2.94-2ubuntu3_amd64.deb显示所有文件属于root：
drwxr-xr-x root/root 0 2020-03-26 01:56 ./
drwxr-xr-x root/root 0 2020-03-26 01:56 ./etc/
drwxr-xr-x root/root 0 2020-03-26 01:56 ./etc/default/
-rw-r--r-- root/root 562 2019-01-02 12:50 ./etc/default/transmission-daemon
drwxr-xr-x root/root 0 2020-03-26 01:56 ./etc/init/
-rw-r--r-- root/root 654 2019-01-02 12:50 ./etc/init/transmission-daemon.conf
drwxr-xr-x root/root 0 2020-03-26 01:56 ./etc/init.d/
-rwxr-xr-x root/root 1975 2019-01-02 12:50 ./etc/init.d/transmission-daemon
drwxr-xr-x root/root 0 2020-03-26 01:56 ./etc/transmission-daemon/
-rw-r--r-- root/root 303 2019-01-02 12:50 ./etc/transmission-daemon/README.json
-rw-r--r-- root/root 523 2019-01-02 12:50 ./etc/transmission-daemon/settings.json
drwxr-xr-x root/root 0 2020-03-26 01:56 ./lib/
drwxr-xr-x root/root 0 2020-03-26 01:56 ./lib/systemd/
drwxr-xr-x root/root 0 2020-03-26 01:56 ./lib/systemd/system/
-rw-r--r-- root/root 284 2020-03-26 01:56 ./lib/systemd/system/transmission-daemon.service
drwxr-xr-x root/root 0 2020-03-26 01:56 ./usr/
drwxr-xr-x root/root 0 2020-03-26 01:56 ./usr/bin/
-rwxr-xr-x root/root 543528 2020-03-26 01:56 ./usr/bin/transmission-daemon
drwxr-xr-x root/root 0 2020-03-26 01:56 ./usr/share/
drwxr-xr-x root/root 0 2020-03-26 01:56 ./usr/share/bug/
drwxr-xr-x root/root 0 2020-03-26 01:56 ./usr/share/bug/transmission-daemon/
-rw-r--r-- root/root 95 2019-01-02 12:50 ./usr/share/bug/transmission-daemon/presubj
drwxr-xr-x root/root 0 2020-03-26 01:56 ./usr/share/doc/
drwxr-xr-x root/root 0 2020-03-26 01:56 ./usr/share/man/
drwxr-xr-x root/root 0 2020-03-26 01:56 ./usr/share/man/man1/
-rw-r--r-- root/root 1992 2020-03-26 01:56 ./usr/share/man/man1/transmission-daemon.1.gz
drwxr-xr-x root/root 0 2020-03-26 01:56 ./var/
drwxr-xr-x root/root 0 2020-03-26 01:56 ./var/lib/
drwxr-xr-x root/root 0 2020-03-26 01:56 ./var/lib/transmission-daemon/
drwxr-xr-x root/root 0 2020-03-26 01:56 ./var/lib/transmission-daemon/.config/
drwxr-xr-x root/root 0 2020-03-26 01:56 ./var/lib/transmission-daemon/.config/transmission-daemon/
drwxr-xr-x root/root 0 2020-03-26 01:56 ./var/lib/transmission-daemon/downloads/
lrwxrwxrwx root/root 0 2020-03-26 01:56 ./usr/share/doc/transmission-daemon -> transmission-common
lrwxrwxrwx root/root 0 2020-03-26 01:56 ./var/lib/transmission-daemon/.config/transmission-daemon/settings.json -> /etc/transmission-daemon/settings.json
lrwxrwxrwx root/root 0 2020-03-26 01:56 ./var/lib/transmission-daemon/info -> .config/transmission-daemon
但随后运行ls -lha /etc/transmission-daemon显示apt install transmission-daemon有些文件不属于 root：
total 16K
drwxrwsr-x 2 root debian-transmission 4.0K Jun 20 19:10 .
drwxr-xr-x 106 root root 4.0K Jun 20 19:10 ..
-rw-r--r-- 1 root root 303 Jan 2 2019 README.json
-rw-rw---- 1 debian-transmission debian-transmission 523 Jan 2 2019 settings.json
答案1
为了查看 transmission-daemon 使用的 posi-install 脚本，请运行：
apt download transmission-daemon
传输-daemon_3.00-2ubuntu2_amd64.deb将被下载。
（您的版本号可能略有不同）
现在使用你最喜欢的存档提取器提取 .deb 包，或者右键单击 deb 文件，然后摘录自此处使用您的文件管理器。
在解压的目录中，您应该看到：“control.tar.zst”、“data.tar.zst”、“debian-binary”
现在提取控制文件
您应该查看脚本。（我们对
preinst&感兴趣postinst）请随意看一下
preinst脚本。（只有几行）完成后，打开
postinst脚本并查看该chperms()函数及其用法。