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Quickly add a new user to all groups the default user is in
This is a standard procedure for me, whenever I set up a new Raspberry Pi system. Because the default user is "pi", I quickly replace it with my own (e.g. "kostis"), but I have to substitute that user to all of pi's groups first, before deleting the default account. xargs helps a lot with that in a single line, while avoiding boring "for" loops. For everything trickier, there's always "parallel" :)

download file1 file2 file3 file4 .... file 100

mplayer -vo aa foo.mpg
mplayer -vo caca will give you a similar result but in color

Monitor incoming connections of proxies and balancers.
Maybe this will help you to monitor your load balancers or reverse proxies if you happen to use them. This is useful to discover TIME OUTS and this will let you know if one or more of your application servers is not connected by checking.

Convert embedded spaces in filenames to "_" (underscore)
This command converts filenames with embedded spaces in the current directory replacing spaces with the underscore ("_") character.

locate bin, src, and man file for a command

create a progress bar...
A simple way yo do a progress bar like wget.

Find passwords that has been stored as plain text in NetworkManager

Dump mySQL db from Remote Database to Local Database
You can use this to dump you database from remote db to your local db.

Get Shellcode from ARM Binaries
Getting shellcode from ARM binaries - @OsandaMalith


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