How to cleanup unused kernels from /boot



This is very handy command that I run maybe once or twice a year or when I need to clean up space off the /boot partition on my Linux Servers.

dpkg -l 'linux-*' | sed '/^ii/!d;/'"$(uname -r | sed "s/\(.*\)-\([^0-9]\+\)/\1/")"'/d;s/^[^ ]* [^ ]* \([^ ]*\).*/\1/;/[0-9]/!d' | xargs sudo apt-get -y purge

How to list empty Directories via powershell



I had a need the other day to list directories that was empty.  This code does just that.

(gci C:\Scripts -r | ? {$_.PSIsContainer -eq $True}) | ?{$_.GetFileSystemInfos().Count -eq 0} | select FullName

(replace C:\Scripts with the root directory)
Output example:

FullName
-------
C:\Scripts\Empty
C:\Scripts\Empty Folder 2
C:\Scripts\Empty\Empty Subfolder
C:\Scripts\New Folder\Empty Subfolder Three Levels Deep