Conditions

 Two types of decision-making statements are used within shell scripting. They are –


If-else statement

case-sac statement


If-else statement

If else statement is a conditional statement. It can be used to execute two different codes based on whether the given condition is satisfied or not. There are a couple of varieties present within the if-else statement. 

They are –

====================


if-fi 


Name="Girish"

if [ "$Name" = "Girish" ]; then

  echo "His name is Girish. It is true."

fi


====================

if-else-fi 

====================

Age=17

if [ "$Age" -ge 18 ]; then

    echo "You can vote"

else

    echo "You cannot vote"    

fi


====================

if-elif-else-fi 

====================


Age=17

if [ "$Age" -ge 18 ]; then

    echo "You can vote"

elif [ "$Age" -eq 17 ]; then

    echo "You can vote after one year"

else

    echo "You cannot vote"    

fi


====================

Nested if-else

====================


echo "Enter subject"

read subject


if [ $subject == 'Linux' ]

then

echo "Enter Marks"

read marks

        if [ $marks -ge 30 ]

        then

        echo "You passed"

        else

        echo "You failed"

        fi

else

echo "Wrong Subject"

fi

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