1. Precept I : Lab Environment, Unix, Bash, Emacs

2. Lab Environment (Linux)
Lab machines are administered by TA
IP address range (12 machines) ~
Use SSH protocol to communicate with the lab machine
PuTTY (Windows)
Terminal (Mac OS) ID
Your student number
Password

3. Cygwin Provide Linux-like environment in Windows Install Cygwin
Install Cygwin
Download & run setup.exe
Choose any URL to download files

4. VMware Player Run another OS (Linux, Windows, etc.) on top of main OS
Install VMware
Download VMware Player for Windows 32-bit and 64-bit
Run downloaded file

5. VMware Player Download Linux (Ubuntu) image file
Install Linux on VMware
Click on “Create a New Virtual Machine”
Click on “Browse…” button
Add image file downloaded from website
Insert information : username, password, etc.
Press “Play virtual machine” button

6. Accessing from Outside KAIST
Require virtual private network (VPN) program
At first run, use Internet Explorer!
kvpn.kaist.ac.kr
Log in
Press Start

7. Change Password on All Machines!
Connect to the machine with default ID & PASSWORD
Type “passwd”
In response to “(current) UNIX password:”, type current password
In response to “New password:”, type new password.
In response to “Retype new password:”, type new password again.
Reminder
Each machine does not share files
It is your responsibility to back up your files
Keep the code locally
Use the lab machines only for testing and debugging

8. Unix and Bash

9. Bash Commands For details, read the handout Most useful commands
Description
man <function name>
open manual page
cd <directory name>
change directory
ls [-al]
list files in the directory
mkdir <directory name>
make directory
rmdir <directory name>
remove directory
less/cat/more <file name>
print file content
cp <source> <target>
copy source file to target
mv <source> <target>
rename source file to target

10. Emacs Popular editor Already installed in lab machines
Integrated with GCC compiler driver & GDB debugger
Already installed in lab machines
emacs test.c

11. Emacs Hotkey Hotkey Description Ctrl-k cut line Ctrl/alt-w
cut/copy region
Ctrl-y
paste copied/cut region
Ctrl-x Ctrl-s
save file
Ctrl-s/r <string>
search/recursive string
Ctrl-x Ctrl-f <file>
open file
Ctrl-x 2/3
Split window vertically/horizontally
Ctrl-x o
move to different window
Ctrl-x 1/0
close other/this window
Ctrl-x u
undo
Ctrl-g
abort command
Ctrl-x Ctrl-c
close emacs

12. gcc209 –E hello.c > hello.i
Building C Programs
hello.c
Source code
C language
Contains preprocessor directives
hello.i
Contains declaration of printf()
Missing definition of printf()
#include <stdio.h>
int main(void) {
printf("hello, world\n");
return 0; }
Preprocess
gcc209 –E hello.c > hello.i
C Preprocessor …
int printf(char *format, …)
int main(void) {
printf("hello, world\n");
return 0; }

13. Building C Programs hello.s Source code Assembly language
Missing definition of printf()
Compile
gcc209 –S hello.i
C Compiler
.section .rodata
cGreeting:
.asciz “hello, world\n”
.section .text
.global main
.type
main:
puchl %ebp
movl %esp, %ebp
pushl %cGreeting
call printf
addl $4, $esp
movl $0, %eax
movl %ebp, %esp
popl %ebp
ret

14. Building C Programs hello.o hello Object code Machine language
Missing definition of printf()
hello
Assemble
gcc209 –c hello.s
Assembler … …
Link
gcc209 hello.o –lc -o hello
Linker …
gcc209
is an abbreviation for
gcc –Wall –ansi –pedantic –m32 –march=i386
Shortcut:
gcc209 hello.c –o hello