我编写了一个简单的 bash 脚本来备份主目录，e 将其放入 /var/backups。由于该目录受到保护，因此我以 root 身份编写了脚本，然后设置了 SUID。
armando@ubuntu:~/scripts/bash $ ll
-rwsr-xr-x 1 root root 2596 Jul 28 10:43 homebackup.sh*
即便如此，当脚本尝试写入 /var/backups 时，我会收到“权限被拒绝”错误。为什么？
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In Linux and most other modern UNIX-family systems, setuid bits are only recognized for direct binary executables, not scripts.
This is by design, and for security reasons. You can work around it by building a compiled wrapper for your setuid scripts, or using an existing tool (such as sudo with a configuration to avoid needing a password when calling the specific script as the desired user).
于 2014-07-28T18:02:16.013 回答