####  connect to your csci235 directory
cd ~/csci235

####  using your favorite text editor, create a C file containing the following code
####  I'll call my file funlab.c

#include <stdio.h>
#include <stdlib.h>

int main(int argc, char *argv[]) {
  for (int i=0; i<argc; ++i) {
    printf("arg %3d is %s\n", i, argv[i]) ;
  }
  return 0 ;
}

#### Compile the C program using the instructor (and textbook author) flavored options

$$$$ gcc -std=c99 -Wpedantic -g -Og -o funlab funlab.c

#### Run it

$$$$  ./funlab do re mi

#### Typing that big set of gcc option every time will get tedious.
#### The bash shell allows you to create functions!

#### First look at the man page for cut
$$$$ man cut

$$$$ cat /etc/passwd
$$$$ cut --delimiter=: --fields=1,6 /etc/passwd
$$$$ cut --fields=1 --delimiter=: 
.... hello are your paying attention
.... The colon:please
.... ^D
$$$$ cut --fields=1 --delimiter=.
.... funlab.c
.... ^D
$$$$ echo funlab.c | cut --fields=1 --delimiter=.
$$$$ PREFIX=`echo ugh.c | cut --fields=1 --delimiter=.`
$$$$ echo $PREFIX

#### You can define functions in the Bash Shell!  Type *very* carefully
function c235 {
    MYFILE=`echo $1 | cut --fields=1 --delimiter=.`
    echo gcc -std=c99 -Wpedantic -g -Og -o $MYFILE $1
    gcc -std=c99 -Wpedantic -g -Og -o $MYFILE $1
}

#### Try it out!

$$$$ c235 funlab.c
$$$$ ls -lt funlab
$$$$ funlab

#### but.... How do you make this last!
$$$$ echo $PATH

#### You should see your bin directory!
#### Create a file /home/YOURID/bin/c235 with the following contents

#! /bin/bash 
PREFIX=`echo $1 | cut --fields=1 --delimiter=.`
echo RUNNING: gcc -std=c99 -Wpedantic -Og -g -o $PREFIX $1
gcc -std=c99 -Wpedantic -Og -g -o $PREFIX $1

#### Make sure it is executable
$$$$ chmod a+x ~/bin/c235
$$$$ ls -l ~/bin/c235

#### Be sure the shell can find it! And then try it out
$$$$ which c235
$$$$ c235 funlab.c
$$$$ funlab


#### Try to compile your program with the defaults!
$$$$ c235 funlab.c

#### If you want to be a sys admin, you *must* learn to write scripts.
#### Most of these are written in the Unix shell and its derivatives;
#### however perl (and sometimes Python) are also popular.
#### [One UNC Asheville ITS sys admin claims 20,000 lines of perl.]