name=Jackson
echo $name

name="Jackson"
echo $name

<>()[]{}*?$|&#;`'"

a="5"
b=10

echo "$a + $b = "$(($a+$b));

x=10/2
echo "$x" # output: 10/2
declare -i x=10/2
echo "$x" # output: 5
declare -i x=what
echo "$x" # output: 0

a=5
declare -i b=10
a=$a/5
b=$b/5
echo "$a $b" #output: 5/5 2
a=hello
b=world
echo $a$b #output hello0

unset name
name="Michael Jackson" ; echo "$name"

unset name #to reset name, see comments
name=Michael Jackson ; echo "$name"

cd "${var}"

cd $var

for i in $var ; do something_using_i ; done