Øvelse 1

Exercise 1.4.1 File & Directory operations

Open a terminal and write down which commands you use to: 

Display the full path of the current folder:
- We use the command 'pwd' (print name of working directory)

Get a list of all files and folders in the current folder:
- We use 'ls'

Change directory to /home/stud:
- We use ' cd /home/stud'

Create a directory /home/stud/test:
- We use 'mkdir /home/stud/test'

Change directory to the subdirectory /home/stud/test:
- 'cd /home/stud/test'

Create a file text1 containing hello there using kate:
- We use 'kate -n' and saves as text1

Create a file text2 containing hello there using echo:
- We use 'echo hello there > text2'

Append 1234567890 to file text1 using echo:
- We write 'echo 1234567890 >> text1'

Dump the contents of text1 to the terminal window:
- We write 'cat text1'

Copy text1 to the directory /tmp:
- We write 'cp text1 ../tmp'

Delete text1 and text2 in one go:
- We use 'rm "text1" "text2"

Delete the directory /home/stud/test:
- We use 'rmdir test'

Exercise 1.4.2 Program control

Run program the kate in the background:
- We use 'kate&'

Now kill the program kate you just started:
- We write 'pkill kate'

Write a small shell script that lists the current directory. Remember to make you shell
script executable using the program chmod.
1. chmod command:
- We write 'chmod +x <filename>'

2. Shell script:

#!/bin/bash

ls

Exercise 1.4.3 Acquiring system information

Get a list of the currently running processes (programs):
- We use 'top'

Display the current date and time in the terminal:
- We use 'date'

Find the IP address of the network adapter eth0:
- We write 'ip addr show eth0'

Explain what the /var/log/syslog does:
- It makes a log for what your system does

Try using running less /var/log/syslog and read the manual for less. What is it
good for?
- It shows the most important things from the log

What happens when you run dmesg?:
- It prints the message buffer of the kernel. Is used to examine the kernel buffer.

Extending the above like this dmesg|less, what does | do?:
- It allows the output to be moved forward one screenful at a time by pressing the SPACE bar, backward by pressing the b key and removed by pressing the q key.

Determine the CPU type by looking the directory /proc:
- Write 'less /proc/cpuinfo'

There is a lot of system information to find in /proc, mention at least 3 different files and
what they tell you:
1. timer_list - Show how the timers works
2. uptime - Show how long time the system has been on, and how many users there is
3. version - Show the version of Linux