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Calculate files' size

Copy the text from the 3rd line to the 9th line into a new file with VI

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"

recursive search and replace old with new string, inside files
If you can install rpl it's simpler to use and faster than combinations of find, grep and sed. See man rpl for various options. time on above operation: real 0m0.862s, user 0m0.548s, sys 0m0.180s using find + sed: real 0m3.546s, user 0m1.752s, sys 0m1.580s

Advanced python tracing
Trace python statement execution and syscalls invoked during that simultaneously

tell if a port is in use
if you don't do --numeric-ports, netstat will try to resolve them to names

check open ports without netstat or lsof

How to trim a video using ffmpeg
Will trim the video to 4 seconds starting from the beginning. The -vcodec , -acodec options are required so that ffmpeg knows in what video/audio format you want for the new video.

Show me just the ip address
Sometimes it's useful to output just the ip address. Or some other information, changing the "ipv4.addresses" in command. The power of awk! Show all possible "greps" with $ nmcli connection show [yourInterfaceNameHere]

Add a function you've defined to .bashrc
Example: To store the function addfunction after you have defined it: $ addfunction addfunction


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