Linux – How to prevent syslog message popping in a ssh session without affect other sessions

UPDATE: For an actual answer see zero_r's answer below

This isn't an answer, but a workaround. Use screen.

When you first log in, run screen. You get another shell, run commands in that. If you're disconnected, the screen process keeps the terminal alive so that your shell and the processes it is running don't fall over. When you reconnect, run 'screen -r' to resume.

There's a bunch more to configuring and using screen, but the above should workaround your problem.

You can send the output of cron to a separate log facility add the following to your /etc/syslog.conf file:

# Log cron stuff
cron.*                                                  /var/log/cron

Remember to add /var/log/cron to your /etc/logrotate.d/syslog to ensure it gets rotated, eg

# /etc/logrotate.d/syslog
/var/log/messages /var/log/secure /var/log/maillog /var/log/spooler /var/log/boot.log /var/log/cron {
    sharedscripts
    postrotate
    /bin/kill -HUP `cat /var/run/syslogd.pid 2> /dev/null` 2> /dev/null || true
    endscript
}