A lap 2022. február 8., 05:13-kori változata

Putty

• Download the putty ssh client from the Internet!
• We often want to log in to columbo.eszterhazy.hu. Add this server to Putty! Connect to this machine and log in!
• Remove columbo.eszterhazy.hu from the Putty!
• Set font used in Putty to Courier New, font size 11!
• Make the putty switch to full screen when Alt-Enter is pressed!
• Set the character set used by Putty to UTF-8!

Enter commands

• Bring back to the command line the commands you typed earlier!

feri@aries:~$ Press cursor up and cursor down keys.<megoldas>

• Try the additional function of [TAB] with the clear command!

feri@aries:~$ cl[TAB]

• Find the one of your previous commands that contains the cl characters!

feri@aries:~$ [CTRL]-[R]cl

• How to interrupt the program currently running?

feri@aries:~$ [CTRL]-[C]

Basic Unix commands

• Clear the screen.

feri@aries:~$ clear

• Generate passwords!

feri@aries:~$ pwgen

• Change your password! For the new password, use one of the passwords generated in the previous exercise.

feri@aries:~$ passwd
Changing password for feri
(current) UNIX password: 
new password:
new password:

• Who is logged into the system? How long have they been using it? How long have they been inactive? What command are they currently running?

feri@aries:~$ w

• How busy is the server currently?

feri@aries:~$ w

• Show the last logged in users! Show the last 10 logins!

feri@aries:~$ last
feri@aries:~$ last -10

• Write a message to your classmate!

feri@aries:~$ write B6WSTK
uzenet ide
[CTRL]-[C]

• Disable and then enable receiving messages! Check that you have achieved the desired functionality!

feri@aries:~$ mesg n
feri@aries:~$ mesg y

• Try the talk command with your neighbour!

feri@aries:~$ talk bela

• Check the date command manual!

feri@aries:~$ man date

• Generate 6 passwords, each 12 characters long, difficult to remember and therefore secure (see the manual for details).

feri@aries:~$ man pwgen
feri@aries:~$ pwgen -s 12 6

• How should you parameterize the date command to print only the year?

feri@aries:~$ man date
feri@aries:~$ date '+%Y'

• Make the c command also clear the screen and the d command print the current system date!

feri@aries:~$ alias c=clear
feri@aries:~$ alias d=date
feri@aries:~$ c
feri@aries:~$ d

• The ls command should always display the complete table of contents, not just the file names!

feri@aries:~$ alias ls='ls -l'
feri@aries:~$ ls

• Display these aliases!

feri@aries:~$ alias

• Show or hide the aliases of the previous exercise.

feri@aries:~$ unalias c d ls
feri@aries:~$ alias

• Log out from columbo!

feri@columbo:~$ logout vagy [CTRL]+[D]