KSH IF Command Conditional Scripting Examples

Here are some examples of using the if command for conditional scripting in KSH (Korn Shell):

Basic if statement

if [ condition ]; then
  commands
fi

The condition is a Boolean expression that is evaluated as either true or false. If the condition is true, the commands will be executed.

Here is an example of an if statement that checks if a variable is equal to a string:

my_var="apple"

if [ "$my_var" = "apple" ]; then
  echo "The variable is equal to 'apple'"
fi

If-else statement

if [ condition ]; then
  commands1
else
  commands2
fi

If the condition is true, the commands1 will be executed. If the condition is false, the commands2 will be executed.

Here is an example of an if-else statement that checks if a variable is equal to a string:

my_var="apple"

if [ "$my_var" = "apple" ]; then
  echo "The variable is equal to 'apple'"
else
  echo "The variable is not equal to 'apple'"
fi

If-elif-else statement

if [ condition1 ]; then
  commands1
elif [ condition2 ]; then
  commands2
else
  commands3
fi

The if-elif-else statement allows you to specify multiple conditions and sets of commands. If condition1 is true, commands1 will be executed. If condition1 is false and condition2 is true, commands2 will be executed. If both condition1 and condition2 are false, commands3 will be executed.