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Benefits of Control Structures in Linux

TLDR; Control structures in Linux allow you to control the flow of your code. There are three main types of conditional statements in Linux: if, if-else, and if-elif-else. Looping structures in Linux include while, for, and until. Case statements allow you to execute different code blocks depending on a variable’s value.

Control Structures

Control structures are a fundamental part of programming that allow you to control the flow of your program. In Linux, there are several different control structures that you can use to control the flow of your code, including conditional statements, looping structures, and case statements.

Conditional Statements in Linux

Conditional statements in Linux allow you to execute code based on whether a certain condition is true or false. There are three main types of conditional statements in Linux: the if statement, the if-else statement, and the if-elif-else statement.

The if statement

The if statement is the simplest type of conditional statement in Linux. It allows you to execute a block of code only if a certain condition is true. Here’s an example:

if [ $x -eq 5 ]
then
  echo "x is equal to 5"
fi

In this example, we use the if statement to check if the variable x is equal to 5. If it is, we execute the echo command to print a message to the console.

The if-else statement

The if-else statement is a type of conditional statement that allows you to execute one block of code if a certain condition is true, and another block of code if it is false. Here’s an example:

if [ $x -eq 5 ]
then
  echo "x is equal to 5"
else
  echo "x is not equal to 5"
fi

In this example, we use the if-else statement to check if the variable x is equal to 5. If it is, we execute the first echo command, and if it’s not, we execute the second echo command.

The if-elif-else statement

The if-elif-else statement is a type of conditional statement that allows you to check multiple conditions and execute different blocks of code depending on which condition is true. Here’s an example:

if [ $x -eq 5 ]
then
  echo "x is equal to 5"
elif [ $x -eq 6 ]
then
  echo "x is equal to 6"
else
  echo "x is not equal to 5 or 6"
fi

In this example, we use the if-elif-else statement to check if the variable x is equal to 5, 6, or neither. Depending on the result, we execute different echo commands.

Looping Structures in Linux

Looping structures in Linux allow you to execute a block of code multiple times. There are three main types of looping structures in Linux: the while loop, the for loop, and the until loop.

The while loop

The while loop is a type of looping structure that allows you to execute a block of code repeatedly while a certain condition is true. Here’s an example:

x=1
while [ $x -le 5 ]
do
  echo $x
  x=$(( $x + 1 ))
done

In this example, we use a while loop to print the numbers 1 to 5 to the console.

The for loop

The for loop is a type of looping structure that allows you to iterate over a list of items and execute a block of code for each item. Here’s an example:

for i in 1 2 3 4 5
do
  echo $i
done

In this example, we use a for loop to print the numbers 1 to 5 to the console.

The until loop

The until loop is a type of looping structure that allows you to execute a block of code repeatedly until a certain condition is true. Here’s an example:

x=1
until [ $x -gt 5 ]
do
  echo $x
  x=$(( $x + 1 ))
done

In this example, we use an until loop to print the numbers 1 to 5 to the console.

Case Statements in Linux

Case statements in Linux allow you to execute different blocks of code depending on the value of a certain variable. Here’s an example:

case $x in
  1)
    echo "x is 1"
    ;;
  2)
    echo "x is 2"
    ;;
  *)
    echo "x is not 1 or 2"
    ;;
esac

In this example, we use a case statement to check the value of the variable x. Depending on the value, we execute different echo commands.

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