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List all packages in Ubuntu/Debian that no package depends on

remove the last of all html files in a directory
sed can be used deleting the last line and with -i option, there's no need to for temp files, the change is made on the actual file

Get a MySQL DB dump from a remote machine
This command will dump a database on a remote stream to stdout, compress it, stream it to your local machine, decompress it and put it into a file called database.sql.You could even pipe it into mysql on your local machine to restore it immediately. I had to use this recently because the server I needed a backup from didn't have enough disk space.

add repeated watermark to image

Replace strings in text
-e is the script function, it performs search and replace like vi, and -i is the edit the file in place.

Find usb device in realtime
Using this command you can track a moment when usb device was attached.

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"

Equivalent to ifconfig -a in HPUX
Command is properly working on HP-UX 11.31

Detect illegal access to kernel space, potentially useful for Meltdown detection
Based on capsule8 agent examples, not rigorously tested

Show directories in the PATH, one per line
The output of "echo $PATH" is hard to read, this is much easier. The parentheses ensure that the change to the input field separator (IFS) only happens the the sub shell and not affecting the current shell.


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