For me only

If I want to change the root directory for docker images, I can have the below /etc/docker/daemon.json file.

1. {
2. "data-root" : "/my/path/to/docker/images"
3. }

If I want to change the root directory for docker images, I can have the below /etc/docker/daemon.json file. Before doing these changes, stop docker by

$  sudo systemctl stop docker

Then update the /etc/dicker/daemon.json file 

And then:

$ sudo systemctl start  docker

If I want to kill all the bash process except the current bash process, use the below the below bash function:

1. kallbatch() {
2. for i in ` ps -ef | grep bash | grep -v grep | grep -v libexec | awk ' { print $2 } ' `
3. do
4. if [ $$ -ne $i ] ; then
5. sudo kill -9 $i
6. fi
7. done
8. }