Comparison operators for strings

The comparison for strings are different than for numbers. Here is a partial list:

Operator	Explanation
=	This stands for equal to
!=	This stands for not equal to
>	This stands for greater than
<	This stands for less than

Now let's take a look at Script 3:

Chapter 2 - Script 3

  1  #!/bin/sh
  2  #
  3  # 6/13/2017
  4  #
  5  echo "script3"
  6  
  7  # String variables
  8  str1="Kirk"
  9  str2="Kirk"
 10  str3="Spock"
 11  str3="Dr. McCoy"
 12  str4="Engineer Scott"
 13  str5="A"
 14  str6="B"
 15  
 16  echo str1=$str1 str2=$str2 str3=$str3 str4=$str4
 17  
 18  if [ "$str1" = "$str2" ] ; then
 19   echo str1 equals str2
 20  else
 21   echo str1 does not equal str2
 22  fi
 23  
 24  if [ "$str1" != "$str2" ] ; then
 25   echo str1 does not equal str2
 26  else
 27   echo str1 equals str2
 28  fi
 29  
 30...