ls -l
./cowsay Hi Marty
./cowthink Hi Marty
./cowthink no way
pico .bash_profile
exit
man cp
ls
touch jay
touch marty
cp marty jay
cp -i marty jay
pico .bash_
pico .bash_profile 
./.bash_profile
bash .bash_profile
cp marty jay
source .bash_profile 
cp marty jay
cp
pico .bash_profile 
AGE=14
echo AGE
echo $AGE
echo You are $AGE years old.
echo "You are $AGE years old."
echo 'You are $AGE years old.'
echo $AGE
echo $foo
echo "you are $foo years old"
echo $stepp
whoami
`whoami`=Marty
$(`whoami`)=Marty
MYNAME=`whoami`
echo $MYNAME
MYNAME=`ls -l`
ls -l
echo $MYNAME
x=42
y=15
z=x+y
echo z
echo $z
z=$x+$y
echo z
echo $z
let z="x + y"
echo $z
let z="$x + $y"
echo $z
x=marty
let z="$x + $y"
echo $z
s="hi"
s="$ss"
echo $s
s="hi"
s=${s}s
echo $s
pico .bash_profile 
source .bash_profile 
hostname
man hostname
hostname -s
pico .bash_profile 
hostname -s
source .bash_profile 
pico .bash_profile 
source .bash_profile 
pwd
man pwd
cd Desktop/
cd ..
pico .bash_profile 
source .bash_profile 
q