Collection of bash tricks

tricks.sh

# Average file size in folder
# Credits: http://www.bradlanders.com/2011/04/27/bash-one-liner-average-file-size-in-current-directory/
ls -l | awk '{s+=$5} END {print "Average file size: " s/NR/1024 "k"}'

# Clear Docker related data
docker kill $(docker ps -q)                       # Kill running containers
docker rm $(docker ps -a -q)                      # Remove existing containers
docker rmi $(docker images -q)                    # Remove images
docker rmi $(docker images -q -f dangling=true)   # Remove untagged images
## one-liner
docker kill $(docker ps -q); docker rm $(docker ps -a -q); docker rmi $(docker images -q); docker rmi $(docker images -q -f dangling=true)