Tools OS wall

[junxnone]

wall

• 向所有终端广播信息

$ wall --help

Usage:
 wall [options] [<file> | <message>]

Write a message to all users.

Options:
 -g, --group <group>     only send message to group
 -n, --nobanner          do not print banner, works only for root
 -t, --timeout <timeout> write timeout in seconds

 -h, --help              display this help
 -V, --version           display version

For more details see wall(1).

UseCase

• 需要重启时，提前广播信息

简单广播

• 用户发送如下命令

$ wall "The system will be restarted in 10 minutes."

• 其他终端会收到如下命令

Broadcast message from xxx@xxx (pts/0) (Fri Mar 24 10:22:32 2023

The system will be restarted in 10 minutes.

隐藏 第一行信息 -n

• 需要 root 用户 或 sudo 权限

$ sudo wall -n "The system will be restarted in 10 minutes."

广播到 Group -g

• 向 devs group 广播

$ wall -g devs "The system will be restarted in 10 minutes."