$ docker run -ti ubuntu bash
Unable to find image 'ubuntu:latest' locally
latest: Pulling from library/ubuntu
Digest: sha256:747d2dbbaaee995098c9792d99bd333c6783ce56150d1b11e333bbceed5c54d7
Status: Downloaded newer image for ubuntu:latest
root@ff8a382d9828:/# whoami
root
root@ff8a382d9828:/# ls -la
total 56
drwxr-xr-x   1 root root 4096 May 27 05:54 .
drwxr-xr-x   1 root root 4096 May 27 05:54 ..
-rwxr-xr-x   1 root root    0 May 27 05:54 .dockerenv
lrwxrwxrwx   1 root root    7 Apr 23 11:06 bin -> usr/bin
drwxr-xr-x   2 root root 4096 Apr 15 11:09 boot
drwxr-xr-x   5 root root  360 May 27 05:54 dev
drwxr-xr-x   1 root root 4096 May 27 05:54 etc
drwxr-xr-x   2 root root 4096 Apr 15 11:09 home
lrwxrwxrwx   1 root root    7 Apr 23 11:06 lib -> usr/lib
lrwxrwxrwx   1 root root    9 Apr 23 11:06 lib32 -> usr/lib32
lrwxrwxrwx   1 root root    9 Apr 23 11:06 lib64 -> usr/lib64
lrwxrwxrwx   1 root root   10 Apr 23 11:06 libx32 -> usr/libx32
drwxr-xr-x   2 root root 4096 Apr 23 11:06 media
drwxr-xr-x   2 root root 4096 Apr 23 11:06 mnt
drwxr-xr-x   2 root root 4096 Apr 23 11:06 opt
dr-xr-xr-x 426 root root    0 May 27 05:54 proc
drwx------   2 root root 4096 Apr 23 11:09 root
drwxr-xr-x   1 root root 4096 Apr 24 01:07 run
lrwxrwxrwx   1 root root    8 Apr 23 11:06 sbin -> usr/sbin
drwxr-xr-x   2 root root 4096 Apr 23 11:06 srv
dr-xr-xr-x  13 root root    0 May 27 05:54 sys
drwxrwxrwt   2 root root 4096 Apr 23 11:09 tmp
drwxr-xr-x   1 root root 4096 Apr 23 11:06 usr
drwxr-xr-x   1 root root 4096 Apr 23 11:09 var
root@ff8a382d9828:/# cd /root/
root@ff8a382d9828:~# ls
root@ff8a382d9828:~# ls -la
total 16
drwx------ 2 root root 4096 Apr 23 11:09 .
drwxr-xr-x 1 root root 4096 May 27 05:54 ..
-rw-r--r-- 1 root root 3106 Dec  5 14:39 .bashrc
-rw-r--r-- 1 root root  161 Dec  5 14:39 .profile
root@ff8a382d9828:~# cat .bashrc 
# ~/.bashrc: executed by bash(1) for non-login shells.
# see /usr/share/doc/bash/examples/startup-files (in the package bash-doc)
# for examples