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Introduction to user commands
Tested on debian and ubuntu. Translations could be useless, so "LANG=C man intro" is a better alternative.

Change files case, without modify directories, recursively
Change files case, without modify directories, recursively. ... fucking vfat

Turn shell tracing and verbosity (set -xv) on/off with 1 command!
Turn shell tracing and verbosity (set -xv) on/off in any Bourne-type shell If either -x or -v is set, the function turns them both off. If neither is on, both are turned on.

Delete all non-printing characters from a file
tr has some predefined sets of characters that are more convenient to use than characters codes

Random unsigned integer
works at least in bash. returns integer in range 0-32767. range is not as good, but for lots of cases it's good enough.

Which files/dirs waste my disk space
I added -S to du so that you don't include /foo/bar/baz.iso in /foo, and change sorts -n to -h so that it can properly sort the human readable sizes.

check open ports without netstat or lsof

Router discovery

Add a shadow to picture
Please take notice that if you are going to use an JPG file for shadow effect, let change -background none to -background white! Because -background none make a transparent effect while JPG doesn't support transparent! And when viewing, you will get a bacl box! So we will use an white background under! We can use other color as well!

find all file larger than 500M


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