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Extract audio from a video
With the -vn switch we make our intentions clear and ask FFmpeg not to bother itself with the video. Next we specify the audio codec copy, which tells FFmpeg to use the same codec to encode the audio, which it uses to decode it. To keep things simple, we'll just keep the sampling and bitrate values the same.

List of directories sorted by number of files they contain.

One line Perl Script to determine the largest file sizes on a Linux Server
This one line Perl script will display the smallest to the largest files sizes in all directories on a server.

Convert a date to timestamp
Simple way to get a timestamp from a date

Recompress all .gz files in current directory using bzip2 running 1 job per CPU core in parallel

check open ports without netstat or lsof

Ping all hosts on 192.168.1.0/24
Pings all the hosts on 192.168.1.0/24 in parallel, so it is very fast. Alive host IP addresses are echoed to stdout as pings are responded to.

Disco lights in the terminal

SSH connection through host in the middle

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


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