Ubuntu commands

Kill all java processes:

killall java -9 Copy ssh key from u1 to u2, the same public key will be used. Then in new U2 the Permission of public key will be changed. and the keys will be added in u2 Ubuntu SSH Key Permission: chmod 600 ~/.ssh/gitlab_rsa

chmod 644 ~/.ssh/gitlab.pub

ssh-add ~/.ssh/gitlab_rsa

ls -hl total 216K drwx-----x 3 root root 4.0K Jan 10 12:55

df -h

Filesystem Size Used Avail Use% Mounted on udev 32G 0 32G 0% /dev