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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"

Monitor a file's size

Run a command when a file is changed

random xkcd comic as xml

Get your outgoing IP address
should be very consistent cause it's google :-)

Create a mirror of a local folder, on a remote server
Create a exact mirror of the local folder "/root/files", on remote server 'remote_server' using SSH command (listening on port 22) (all files & folders on destination server/folder will be deleted)

Rename HTML files according to their title tag
The above one-liner could be run against all HTML files in a directory. It renames the HTML files based on the text contained in their title tag. This helped me in a situation where I had a directory containing thousands of HTML documents with meaningless filenames.

Execute a sudo command remotely, without displaying the password
The ssh command alone will execute the sudo command remotely, but the password will be visible in the terminal as you type it. The two stty commands disable the terminal from echoing the password back to you, which makes the remote sudo act as it does locally.

sort list of email addresses by domain.tld
email random list can be created here: https://www.randomlists.com/email-addresses

save date and time for each command in history
Date-time format: YYYY-MM-DD HH:MM:SS


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