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README.md
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In the movie TRON: Legacy, Linux is rebranded "SolarOS" in reference to Solaris, another Unix OS
Start the VM to boot the previously installed Debian system.
Do the following for both a user and the superuser (root
) :
- Login in the console
- Clear the console using the keyboard shortcut
- Change the password to this :
michelle
- Show the command history using five keystrokes or less (using autocompletion)
- Log out using the keyboard shortcut
Just numbers
Login as root
on the third Linux console.
Check the Internet connectivity with the command ping google.com
.
After a few hops, interrupt the program with : Ctrl + C.
Behind every name in a computer system there is a number (ID, index, address, etc) :
- User identifier
root
→0
student
→1000
- IP address
- google.com → 216.58.214.14 (quad-dotted notation) →
3627734542
- tencent.com → 117.169.101.44 (quad-dotted notation) →
1974035756
- google.com → 216.58.214.14 (quad-dotted notation) →
- File inode
/etc/fstab
→44696029
.profile
→59639363
- Port
HTTP
→80
HTTPS
→443
- Process identifier
cron
→254
Names exist because they are human readable, but behind the scenes they are converted into numbers, unique in their namespace :
- A domain name can have several IP addresses, but an IP address can only identify one domain name
- Several processes may have the same name, but a PID identifies a single process
Find the commands to get :
- the inode of a specific file
- the current user ID
- the PID of a program, for example
bash