Useful bash one-liners

bash_utilities.sh

# Remove all empty folders
find . -maxdepth 1 -type d -empty -print0 > empty.txt; xargs -0 rmdir < empty.txt

# Remove empty folders 2 levels deep, and their parent
find . -maxdepth 2 -type d -empty > empty.txt; rmdir $(<empty.txt)
find . -maxdepth 1 -type d -empty > empty.txt; rmdir $(<empty.txt)

# Move all folders with certain name into their own named folder
find -maxdepth 2 -name 'lavajava' -printf '%h\n' > lavajava.txt; mkdir lavajava; mv $(<lavajava.txt) lavajava/

# Move root dir files in subdirs into a root folder
find -maxdepth 2 -type f -printf '%h\n' > files.txt; mv $(<files.txt) root/

# Sort Trillian XML chat log by time
sed -r 's/^.*time="([^"]+)".*$/\1 &/' newfile.xml|sort -n|sed 's/[^ ]* //'

# Rename Samsung Voice recorder files to prefix their Media Create date
exiftool '-FileName<CreateDate' -d "%Y%m%d_%H%M%S %%f.%%e" -api QuickTimeUTC=1 *.m4a