Linux下能不能做条件判断,在某一行插入内容?
例如我想将用户“test”添加到 /etc/sudoers 以让其可以切换到 root:
1 #
2 # This file MUST be edited with the 'visudo' command as root.
3 #
4 # Please consider adding local content in /etc/sudoers.d/ instead of
5 # directly modifying this file.
6 #
7 # See the man page for details on how to write a sudoers file.
8 #
9 Defaults env_reset
10 Defaults mail_badpass
11 Defaults secure_path="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/snap/bin"
12
13 # Host alias specification
14
15 # User alias specification
16
17 # Cmnd alias specification
18
19 # User privilege specification
20 root ALL=(ALL:ALL) ALL
21
22 # Members of the admin group may gain root privileges
23 %admin ALL=(ALL) ALL
24
25 # Allow members of group sudo to execute any command
26 %sudo ALL=(ALL:ALL) ALL
27
28 # See sudoers(5) for more information on "#include" directives:
29
30 #includedir /etc/sudoers.d
我希望我的命令找到第 20 行( if root ALL=(ALL:ALL) ALL )然后在第 21 行添加以下内容
test ALL=(ALL:ALL) ALL
Linux 命令可以做到这一点吗?或者我只能通过 Perl 或 Python 等编码来实现?
我对 Linux 还很陌生,任何帮助都非常感谢!
答案1
无论您在何处添加该行,sudo 都不会关心其顺序。
只需将其附加到末尾即可:
echo 'test ALL=(ALL:ALL) ALL' | sudo tee -a /etc/sudoers
或者,更好的是,使用它的包含目录:
echo 'test ALL=(ALL:ALL) ALL' | sudo tee /etc/sudoers.d/test
这样,当包更新期间 sudoers 文件发生变化时,您不必手动更新它。