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IP addresses connected to port 80
IP addresses and number of connections connected to port 80.

Tail a log-file over the network
Netcat is used to serve a log-file over a network on port 1234. Point a browser to the specified server/port combo to view log-file updates in real-time.

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"

List hostnames of all IPs

Carriage return for reprinting on the same line
The above code is just an example of printing on the same line, hit Ctrl + C to stop When using echo -ne "something\r", echo will: - print "something" - dont print a new line (-n) - interpret \r as carriage return, going back to the start of the line (-e) Remember to print some white spaces after the output if your command will print lines of different sizes, mainly if one line will be smaller than the previous Edit from reading comments: You can achieve the same effect using printf (more standardized than echo): while true; do printf "%-80s\r" "$(date)"; sleep 1; done

separate (emphasize) digital strings from other text

View online pdf documents in cli
Probably will not work very well with scanned documents.

cp the file
Copy the file with the given .extension at the source file's location. Eliminates the typing of long paths again and again.

GZip all files in a directory separately
It gzip each file in a directory separately

Check Ram Speed and Type in Linux
from http://maysayadkaba.blogspot.com/2008/08/linux-check-ram-speed-and-type.html


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