===============================================================================
Example 1 - Arithemtic Comparisions - intro1
-------------------------------------------------------------------------------



#!/bin/bash

num0=10
num1=10
num2=10
num3=30
num4=40

if [ $num1 -eq $num2 ]
then
   echo $num1 is the same as $num2
fi

if [ $num3 -gt $num2 ]
then
   echo $num3 is greater than $num2
fi

if [ $num3 -lt $num4 ]
then 
   echo $num3 is less than $num4
fi

if [ $num1 -ne $num4 ]
then
   echo $num1 is not equal to $num4
fi

if [ $num0 -le $num1 ]
then
   echo $num0 is less than or equal to $num1
fi

if [ $num1 -ge $num0 ]               
then
   echo $num1 is greater than or equal to $num0
fi




===============================================================================
Example 2 - String comparisons - intro2
-------------------------------------------------------------------------------
#!/bin/bash



# Please see 1. and 2. below (for more information)

# 1     http://www.ibm.com/developerworks/opensource/library/l-bash-test/index.html
# 2.    http://tldp.org/LDP/abs/html/refcards.html
# 3.    http://tldp.org/LDP/abs/html/comparison-ops.html#SCOMPARISON1

string1=abc
string2=abc
string3=abcd
string4=abcde

if [ $string1 = $string2 ]
then
   echo $string1 is equal to $string2
fi

if [ $string1 !=  $string3 ]
then
   echo $string1 is NOT equal to $string3
fi

if [ $string2 \< $string3 ]
then
   echo $string2 is less than $string3
fi

if [ $string3 \> $string2 ]
then
   echo $string3 is greater than $string2
fi

if [ $string1 \< $string4 ] || [ $string1 = $string4 ] 
then
   echo $string1 is less than or equal to $string4
fi

if [ $string4 \> $string1 ] || [ $string4 = $string1 ]
then
   echo $string4 is greater than or equal to $string1
fi


===============================================================================
Example 3 - Other Examples - intro3
-------------------------------------------------------------------------------

#!/bin/bash

# Reference: http://www.ibm.com/developerworks/opensource/library/l-bash-test/index.html

[ "abc" != "def" ];echo $?
[ "abc" != "abc" ];echo $?
test -d "$HOME" ;echo $?
[ -d "$HOME" ];echo $?
[ -d /bin ];echo $?
[ -d /binny ];echo $?
test 3 -gt 4 && echo True || echo false


===============================================================================
Example 4 - Other examples - intro3
-------------------------------------------------------------------------------

#!/bin/bash

# Reference: http://www.ibm.com/developerworks/opensource/library/l-bash-test/index.html

if test -d "$HOME"
then
   echo directory $HOME present
else
   echo direcotry $HOME present
fi


if test -d /bin
then
   echo directory /bin present
else
   echo direcotry /bin not present
fi

if test -d /binny
then
   echo directory /binny present
else
   echo direcotry /binny not present
fi