PlayGround
Delete all lines beginning with a # from a file
sed '/^#/d'
sed -i '/^#/d'
Remove From ssh known_hosts file
sed -i -n '/#/!p' /root/.ssh/known_hosts
Create Users Trash Bin
cd /to/folder
mkdir -m777 -v .Trash-$UID
chown $USER .Trash-$UID
sed '/^#/d'
sed -i '/^#/d'
sed -i -n '/#/!p' /root/.ssh/known_hosts
cd /to/folder
mkdir -m777 -v .Trash-$UID
chown $USER .Trash-$UID