Where is killall on CentOS?
Help! My CentOS server is running away from me and I can’t find killall! Where is killall? Use pkill process instead, e.g. pkill apache2 Reference:
Operating Systems
Bind fails but no log file that show anything
Your named server suddenly stops working. You go into a mild panic because restarting the service doesn’t show you where it’s failing. It’s as if
Bind fails to start open: /etc/named.conf: permission denied
The log file shows: Mar 14 10:49:10 hostname named[30884]: using 4 UDP listeners per interface Mar 14 10:49:10 hostname named[30884]: using up to 21000 sockets Mar 14
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
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 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