Conditional statements

CONDITIONAL STATEMENTS:

Some of the conditional statements in Linux are-

1)   if..then..fi statement (Simple If)
2)   if..then..else..fi statement (If-Else)
3)   if..elif..else..fi statement (Else If ladder)
4)   if..then..else..if..then..fi..fi..(Nested if


1)   Bash If..then..fi statement
Syntax:
if [ conditional expression ]
then
        statement1
        statement2
Fi




2)   Bash If..then..else..fi statement
Syntax:
If [ conditional expression ]
then
        statement1
        statement2
else
        statement3
        statement4
Fi
Example:




3)   Bash If..elif..else..fi
Syntax:
If [ conditional expression1 ]
then
        statement1
        statement2
elif [ conditional expression2 ]
then
        statement3
        statement4
else
        statement5
fi
Example:




4)   Bash If..then..else..if..then..fi..fi..
Syntax:
If [ conditional expression1 ]
then
        statement1
        statement2
else
        if [ conditional expression2 ]
        then
                    statement3
fi
fi
Example:

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