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holafiesta webradio
musica nel cuore dove c'? musica note di emozioni

convert uppercase filenames in current directory to lowercase
as commented by Urk...

Display the definition of a shell function
Display the code of a previously defined shell function.

firefox: how many eat?

List processes playing sound
When trying to play a sound you may sometimes get an error saying that your sound card is already used, but not by what process. This will list all processes playing sound, useful to kill processes that you no longer need but that keep using your sound card.

convert a mp4 video file to mp3 audio file (multiple files)

grep -v with multiple patterns.
That's what the sed command should've been, sorry.

check web server port 80 response header

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"

route output as next command's parameters


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