Each time a user logs in to a system, the message of the day in the file /etc/motd is displayed. Use /etc/motd to give users information specific to the system, which someone logging in would want to know. Make sure /etc/motd has read permission to others and write permission to root user only:
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1) Login as root or become root user using su
2) Use text editor vi to edit /etc/motd
# vi /etc/motd
3) Edit and save the changes. Next time the user logs in she will be able to see changes.
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| Category | List of Unix and Linux commands |
|---|---|
| File Management | cat |
| Firewall | Alpine Awall • CentOS 8 • OpenSUSE • RHEL 8 • Ubuntu 16.04 • Ubuntu 18.04 • Ubuntu 20.04 |
| Network Utilities | dig • host • ip • nmap |
| OpenVPN | CentOS 7 • CentOS 8 • Debian 10 • Debian 8/9 • Ubuntu 18.04 • Ubuntu 20.04 |
| Package Manager | apk • apt |
| Processes Management | bg • chroot • cron • disown • fg • jobs • killall • kill • pidof • pstree • pwdx • time |
| Searching | grep • whereis • which |
| User Information | groups • id • lastcomm • last • lid/libuser-lid • logname • members • users • whoami • who • w |
| WireGuard VPN | Alpine • CentOS 8 • Debian 10 • Firewall • Ubuntu 20.04 |