1. IT244 - Introduction to Linux / Unix Instructor: Bo Sheng
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IT244 - Introduction to Linux / Unix
Instructor: Bo Sheng

2. Outline Working with the shell Basic file operations
Editing command lines
System info/settings
Help and documents
Everything is case sensitive

3. Basic File Operations List files ( ls ) ls
pwd (print working directory)
ls /
ls /home (see your username?)
ls /home/shengbo/it244

4. Basic File Operations Change directory ( cd ) cd / ls pwd
cd /home/your username/it244

5. Basic File Operations Read files ( cat )
cat /home/shengbo/it244/welcome
cat /var/run/motd.dynamic
Some files are not readable (e.g., binary)
cat /bin/cat

6. Basic File Operations Write/create files ( echo ) ls
echo “hello world” > hello
cat hello
echo “I am your name” >> hello
cat hello hello

7. Basic File Operations Execute files /home/shengbo/it244/exetest
Abort execution
CTRL+C
CTRL+Z and kill
CTRL+Z
jobs
kill %1

8. Editing Command Lines Delete a char Delete a word ( CTRL+W )
“backspace” and “delete”
Delete a word ( CTRL+W )
Delete a line ( CTRL+U )
Arrow keys
Up / down: browse the command history
Left / right: move the cursor

9. System info/settings Which shell we are using? What OS is running?ps
What OS is running?
uname
Something you can’t do (su/sudo)
Try to create a file under /

10. Practice ls
pwd
ls /
ls /home
cd /
cd /home/your username/it244

11. Practice echo “hello world” > hello ls cat hello
echo “I am your name” >> hello
cat hello hello
/home/shengbo/it244/exetest
Press ctrl+c
CTRL+Z
jobs
kill %1

12. Help and Documents --help option System manuals ( man ) man ls man cat
man ssh
man man

14. Help and Documents --help option System manuals ( man )
man ls
man cat
man ssh
man man
Reading long manuals
Press ENTER, SPACE, and Q

15. Help and Documents GNU info / pinfo (menu display) Search Keyword
info ls
info cat
info info
Control+h
Search Keyword
man –k
apropos
whatis

16. Summary File operations System info Help and documents
ls, pwd, cd, cat, echo
CTRL+C, CTRL+Z, kill, jobs
System info
ps, uname
Help and documents
man, info, apropos, whatis

17. Questions
Use man and info to read the manual of ls and find out how to distinguish files from directories.
uname can display a lot more system information. Find a way to display the OS “kernel name” and “kernel release”.