Lets Learn Linux

1
Lets Learn Linux

• Its actually the bash shell but no one is
  listening

2
Open Putty

• Putty - telnet/ssh client
• What is that?
• Host - torch.cs.dal.ca
• Login
• Forget your password?
• See Help Desk

3
What do you remember?

• What do the following commands do
• ls
• pwd
• man ltcommandgt
• eg man ls
• cd ltpathgt
• cd public_html
• cd ../
• cd .

4
Stuff you might have seen

• mkdir playpen
• cd playpen
• touch a
• mv ltsourcegt lttargetgt
• mv a hello.java
• ls -al
• pico hello.java
• Make a Java program that says Hello World
• javac hello.java
• java hello

5
Lets Review

• What did we just do?
• What is pico?
• What did javac do?
• What did java do?
• What does ls and ls -al do?
• What is cd? ../? .?

6
Enter the dragon

• history
• !ltnumber of commandgt
• !3
• more hello.java
• wc hello.java
• tail hello.java
• ls /users/cs/ more

7
What was that ?

• What is happening with
• Time to hack!
• Use tab to help you type out the following
• ls /var/log/apache/
• more /var/log/apache/access_log
• space to see more, q to stop
• tail /var/log/apache/access_log
• tail -f /var/log/apache/access_log grep
  ltusernamegt
• Start browsing your Wordpress site

8
Sweet how do I turn it off?

• ctrl c
• kills the current command
• who
• top
• finger ltusernamegt
• ps -u ltusernamegt

9
Lets Review

• What does history do?
• What does more do?
• What does do?
• How do you stop a command?
• How do you move through the output of a more
  command?

10
The stick of pain

• Be careful
• touch dontDelete.me
• ls
• rm dontDelete.me
• ls
• mkdir ImAfOldEr
• rm ImAfOldEr
• rm -rf ImAfOldEr
• ps -u ltusernamegt
• kill -9 ltpidgt
• kill -9 -1

11
Make backups n00b

• cp hello.java hello.java.bak
• more hello.java.bak
• diff hello.java hello.java.bak
• cp -r public_html website_backup

12
You have been a good class

• You have learned some basics using bash
• interface to Unix / Linux
• If you are comfortable, use torch instead of Java
  Room
• Download / Upload files with WinSCP
• Use tab to auto complete commands
• Learn VIM (Improved VI)
• If you have an old computer - install Linux and
  redo this tutorial at home

13
Questions for Me
14
Questions for You!

• How do you compile a Java program?
• How do you run a Java program?
• How do you edit a file?
• How do you find out who is online?
• How do you get and put files on torch?
• What does kill -9 -1 do?
• What does rm -rf / do?
• What is apache?
• Where do you put files on torch so they can be
  viewed on the Web?
• What permissions must be set on those files?