cat without comments

Change your Desktop background/wallpaper with feh lightweight command.

fill background directory with appropriate content.

Well, this is quite useful for testing if your hardware watchdog is working properly.

Output should be two JPG files named like "output-1.jpg" and "output-2.jpg". The convert command is part of ImageMagick so you'll need that and dependent packages installed to use it.

This is especially useful for adding changes to a temporary repo, such as a Gist. Avoid using this when collaborating with others.

I'm the author of PM2 and wrote this tool, and I'm please to share it here.

Github project link: https://github.com/Unitech/pm2

Handy use of bc in the command line. No need to get 'into' the bc to perform calculations

List packages and their disk usage in decreasing order. This uses the "Installed-Size" from the package metadata. It may differ from the actual used space, because e.g. data files (think of databases) or log files may take additional space.

Just an other solution :)

My first command :) I made this command to log public addresses of a virtual interface who connects random VPN servers around the world.

Full command:

for f in input/*; do BN=$(basename "$f"); ffmpeg -i "$f" -vn "temp/$BN.flac"; sox "temp/$BN.flac" "temp/$BN-cleaned.flac" noisered profile 0.3; ffmpeg -i "$f" -vcodec copy -an "temp/$BN-na.mp4"; ffmpeg -i "temp/$BN-na.mp4" -i "temp/$BN-cleaned.flac" "output/$BN"; done

This was over the 255 character limit and I didn't feel like deliberately obfuscating it.

1. Create 'input', 'output' and 'temp' directories.

2. Place the files that you want to remove the hiss/static/general noise from in the input directory.

3. Generate a noise reduction profile with sox using 'sox an_input_file.mp4 -n trim x y noiseprof profile', where x and y indicates a range in seconds that only the sound you want to eliminate is present in.

4. Run the command.

calls grep on all non-binary files returned by find on its current working directory

This example code is intended to be used as a root permissions check in a script. It makes use of the $EUID (effective user ID) environment variable which is fully su- and sudo-safe.