How to vacuum journalctl
How to free up space if your Linux journal (combined log file) is taking up a lot of space On some systems /var/log might be
Operating Systems
How to sort a Linux directory by date
Use the following flags to order a directory listing by date in forward order: ls -lat To show a directory listing in reverse order, use
How to recover/reset forgotten Gnome Keyring Password?
What is a Linux Keyring? A Linux keyring is a system component that securely stores and manages sensitive information such as passwords, authentication tokens, and
How do you take a screenshot on a Linux desktop?
Printscreen works. If you’re using Chrome, try Awesome Screenshot, but it’s got flaws and sometimes just doesn’t work. 95% good, 5% bad. Otherwise, try: sudo
How do you continuously watch / monitor a Linux command?
Sometimes you want to continuously observe a Linux command. Instead of up arrow and enter the whole time, try this: watch -n 1 “systemctl is-active
How to update the hostname on a Debian system
Try this command first too change your hostname: hostnamectl set-hostname newhostname Exit the terminal, and come back in. If that doesn’t work, also check the
ssh_dispatch_run_fatal: Connection to x.x.x.x port 22: DH GEX group out of range
You’re trying to SSH to a Zyxel switch and get the following message: user@hostname ~ $ ssh [email protected] -p 22 ssh_dispatch_run_fatal: Connection to x.x.x.x port
How to get a script to automatically start on startup on a Debian Linux System
Problem: After your system has started, you need a script to run always. Solution: On a typical Linux system you can simply created an /etc/rc.local
How to see what’s running on a port in Linux
user@hostname ~ $ sudo lsof -i -P -n | grep LISTEN | grep 1025 mailcatch 1104 root 9u IPv4 27240 0t0
How to set up a fault tolerant / failover system on Linux
Problem: You need to make sure that your disks are 100% redundant. Solution: A popular way on Linux to do this is DRBD. Here are