Useful Bash commands

useful-bash.sh

# Find and count file extensions in a directory
find . -type f | sed -e 's/.*\.//' | sort | uniq -c | sort -rn

# Rename group of files
for old in \*.txt; do mv $old `basename $old .txt`.md; done

# Resize group of images
for f in \*.jpg; do convert $f $f.pdf; done

# Download youtube playlist video
youtube-dl -o '%(title)s.%(ext)s' "https://www.youtube.com/watch?v=GYFteQuoT-o&list=PLGOsbT2r-igmFK9IKEGAnBaklqtuW7l8W"