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SSH Notes
SSH Login Message
Acronyms and Definitions
- MOTD = Message of the Day
Login Messages
sudo vim /etc/issue.net
Displays a message before the user begins login, I do not use this.sudo vim /etc/ssh/sshd_config
ensure the following option is setBanner /etc/issue.net
(you can actually used any path/file)sudo systemctl reload sshd
needs to be performed after any change to the configuration file to activate the changes.
sudo vim /etc/motd
Displays the banner text after login. This usually has some predefined Linux distribution text
Login Scripts
ls -la /etc/update-motd.d/
to see the scripts that are run after the MOTD is displayed.
The Debian script is very simple:
#!/bin/sh uname -snrvm
Ubuntu has multiple scripts some that I like and some that I do not like. This system status information script is:
#!/bin/sh # pam_motd does not carry the environment [ -f /etc/default/locale ] && . /etc/default/locale export LANG cores=$(grep -c ^processor /proc/cpuinfo 2>/dev/null) [ "$cores" -eq "0" ] && cores=1 threshold="${cores:-1}.0" if [ $(echo "`cut -f1 -d ' ' /proc/loadavg` < $threshold" | bc) -eq 1 ]; then echo echo -n " System information as of " /bin/date echo /usr/bin/landscape-sysinfo else echo echo " System information disabled due to load higher than $threshold" fi
The main information script is written in python3.
Some Links: