Cron is the time-based job scheduler in Unix-like computer operating systems.
Cron enables users to schedule jobs (commands or shell scripts) to run periodically at certain times or dates.
It is commonly used to automate system maintenance or administration, though its general-purpose nature means that it can be used for other purposes. Continue reading →
Several major companies have been hacked lately. Security advice for web users last week from the US Department of Homeland Security encouraging to disable java on browsers. Disable java in each browser takes time. You will learn how to disable java for all at once. and also for each browser if needed.
Zimbra Active Directory User Mailbox Sync script uses Zimbra utility to Add or Remove mailboxes according to the AD User List.
You can sync all AD users at once or Create a Security Group And add members in order to assign a mailbox. Continue reading →
sSMTP – a simple and lightweight MTA used to deliver mail from a computer to a mail hub (SMTP server) using Gmail SMTP servers.
Unlike Exim4, it does not receive mail, expand aliases, or manage a queue.
How to establish SSH connection without password between two linux/unix machines
Generate the files: [id_rsa], [id_rsa.pub] in the First Machine by typing at command (do not use a password – just hit Enter*) : ssh-keygen
* You don’t want to enter any passwords, because you want to call ssh from a within a shell script.
** The randomart is an easier way for humans to validate keys.
Copy (and rename) id_rsa.pub to authorized_keys on Server (run from the same computer you run ssh-keygen); scp-r-P22/root/.ssh/id_rsa.pub destination:/root/.ssh/authorized_keys<em> </em> Where destination is server B.
Now you can connect as root without a password between the servers.