How to find total filesize grouped by extension

find . -name '*' -type f -printf '%b.%f\0' | awk -F . -v RS='\0' '{if (NF==2) $(NF+1)=" "; s[$NF] += $1; n[$NF]++} END {for (e in s) printf "%15d %6d  %s\n", s[e]*512, n[e], e}' | sort -rn | numfmt --to=iec-i --suffix=B

How can I recursively delete all files of a specific extension in the current directory?

You don't even need to use rm in this case if you are afraid. Use find:

find . -name "*.bak" -type f -delete
But use it with precaution. Run first:

find . -name "*.bak" -type f
to see exactly which files you will remove.

Unzip All Files In A Directory

This works in bash, according to this link:

unzip \*.zip


or 


Just put in some quotes to escape the wildcard:

unzip "*.zip"

sudo apt install usb-creator-gtk

sudo apt install usb-creator-gtk