1. Lecture 11 bash scripting overview c programming overview moving data between c and bash memory and pointers

2. Computational Physics
For many problems the basic equations determining a system's behaviour are
known, but are too complex for an (even approximate) analytical solution.
Chaos theory, weather prediction, quantum mechanics,fluid mechanics.....

3. Example bash script To execute: Save the text file e.g. as “script.sh”
Change the permissions on the file “chmod a+x script.sh”
Run with “./script.sh”

4. Example bash script To execute: Save the text file e.g. as “script.sh”
Change the permissions on the file “chmod a+x script.sh”
Run with “./script.sh”

5. Linux and shell programming
Interpretive language, each line is executed in sequence as if it was typed on the command line..
Environment can be customized e.g.
$PATH and $LD_LIBRARY_PATH
If an executable is not in your path you can run it with an absolute or relative path e.g.
./script.sh
/home/tom/bin/script.sh

6. Help in Linux Man <command>
Lots of information on how to use a command
Google is your friend, if you are stuck someone else has probably already been there

7. C programming Compiled language – More efficient than interpreted
It has become a standard language, many other languages are now based on C.

8. C program structure Include statements interpreted by cpp
Comments help you code
Everything is written as a function
This is what we pass to the function
This is what the function returns
The program always starts from the main function
To use a function you have to call it
Printf is a function defined in stdio.h

9. bash – C interaction Streams open by default Stdin – from the keyboard
Stdout – writes to screen by default.
Stderr – writes to screen by default.
These streams can be redirected
“Prog 2>&1” - writes stderr to screen
“Prog < file-in” – redirects file-in to use as stdin
“Prog > file-out” – redirects stdout to file-out
“Prog 2> stderr-out” redirect stderr to file stderr-out
All other files need to be explicitly opened

10. bash – C interaction stdout stdin
Other files need to be explicitly opened

11. Memory
Every time we want to store something this requires memory to be allocated.
Stack - static memory “int a(100)” pre determined when we compile.
Heap – dynamic, can be changed at runtime. malloc

16. Chris Kervick

17. Michael Tierney