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Join lines
It's works only when you replace '\n' to ONE character.

command shell generate random strong password
shell generate random strong password

Create a mirror of a local folder, on a remote server
Create a exact mirror of the local folder "/root/files", on remote server 'remote_server' using SSH command (listening on port 22) (all files & folders on destination server/folder will be deleted)

Stream YouTube URL directly to mplayer.
Streams youtube video with v=ID directly into the mplayer. If exists, it uses the HD-quality stream. If you don't want to watch it in HD-quality, you can use the shorter form: $ID=52DnUo6wJto; mplayer -fs $(echo "http://youtube.com/get_video.php?&video_id=$ID$(wget -qO - 'http://youtube.com/watch?v='$ID | perl -ne 'print $1."&asv=" if /^.*(&t=.*?)&.*$/')")

Find the package that installed a command

Convert CSV to JSON
Replace 'csv_file.csv' with your filename.

Sed can refference parts of the pattern in the replacement:

matrix in your term
-a : Asynchronous scroll -b : Bold characters on -x : X window mode, use if your xterm is using mtx.pcf

find an unused unprivileged TCP port
Some commands (such as netcat) have a port option but how can you know which ports are unused?

CLFUContest : Check which process consume more than 10% of the cpu (configurable)


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