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list all hd partitions
Only one command and not dependant on full read access to the devices.

convert ascii string to hex
just a bit simpler

create tar archive of files in a directory and its sub-directories
creates a compressed tar archive of files in /path/foo and writes to a timestamped filename in /path.

cpu process limitation for specific processname like java,kibana
apt-get install cpulimit

Remove all HTML tags from a file
A shorter version of command #3014, using awk instead of sed. Useful when scraping websites with a script.

Block all IPv4 addresses that has brute forcing our ssh server
For ipv6 use: grep -oE "\b([0-9A-Fa-f]{1,4}:){7}[0-9A-Fa-f]{1,4}\b"

Which processes are listening on a specific port (e.g. port 80)
swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

Create an SSH tunnel for accessing your remote MySQL database with a local port

convert a line to a space

list files in mtime order
Simple but useful; list files in the current directory in mtime order. Useful if you've been working on something and then take a day or two off.


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