Quickly remove old backup files from backup folder to avoid clutter and keep disk space usage at bay

keeplatests.sh

#Explanation:
# ls -t => Lists the files in a folder in decrescent order of modification time, so it will list newer files first

# sed -e '1,50d'  => Filters the first Nth (50 in this case) lines leaving only the oldest files

# grep -v "lost+found"  => Optional, if you are in a backup disk root you will need this probably, otherwise you can omit it

# awk '{print "/mnt/backup/"$1}'  => Prepend the absolute path to the file name so it's easier to run it in a cron job

# xargs -d '\n' rm  => Takes every lines from the pipe, strips out the newline char and passes it to the rm command

ls -t /mnt/backup | sed -e '1,50d' | grep -v "lost+found" | awk '{print "/mnt/backup/"$1}' | xargs -d '\n' rm