Can we use nested if in shell script?
Nested if-else block can be used when, one condition is satisfies then it again checks another condition. In the syntax, if expression1 is false then it processes else part, and again expression2 will be check.
What is the syntax of nested IF statement in shell scripting?
A syntax of if-else statement in Bash Shell Scripting can be defined as below: if [ condition ]; then.
Is there an Elif in bash?
Bash Else If is kind of an extension to Bash If Else statement. In Bash else-if, there can be multiple elif blocks with a boolean expression for each of them….Syntax of Bash Else IF – elif.
| Similar to Bash If statement, you may provide a single condition or multiple conditions after if keyword. | |
|---|---|
| elif | Else If |
How do you write nested if in bash?
If statement and else statement could be nested in bash. The keyword “fi” indicates the end of the inner if statement and all if statement should end with the keyword “fi”. The “if then elif then else fi” example mentioned in above can be converted to the nested if as shown below.
What is F in shell script?
38. From bash manual: -f file – True if file exists and is a regular file. So yes, -f means file ( ./$NAME. tar in your case) exists and is a regular file (not a device file or a directory for example).
What is D in bash?
-d is a operator to test if the given directory exists or not. This condition is true only when the directory exists. In our example, the directory exists so this condition is true. I am changing the directory variable to “/home/a/b/”.
How does Elif work in bash?
The elif (else if) is used for multiple if conditions. In case one if the condition goes false then check another if conditions. For example, input the marks of a student and check if marks are greater or equal to 80 then print “Very Good”. If marks are less than 80 and greater or equal to 50 then print 50 and so on.
How do I use multiple if in bash?
In Bash elif, there can be several elif blocks with a boolean expression for each one of them. In the case of the first ‘if statement’, if a condition goes false, then the second ‘if condition’ is checked….Syntax of Bash Else If (elif)
- if [ condition ];
- then.
- elif [ condition ];
- then.
- else.
What does %% mean in bash?
The operator “%” will try to remove the shortest text matching the pattern, while “%%” tries to do it with the longest text matching.
What is difference between $* and $#?
So basically, $# is a number of arguments given when your script was executed. $* is a string containing all arguments. For example, $1 is the first argument and so on. This is useful, if you want to access a specific argument in your script.
What does if then elif mean in Bash?
if/then/elif/else statement. In the if/then/elif/else form of the if statement, the first else becomes another if statement or “elif” instead of a simple else. The shell first evaluates condition 1, then condition 2, and so on, stopping with the first condition that succeeds. The statements associated with that successful condition are then
When to use elif keyword in shell script?
To use multiple conditions in one if-else block, then elif keyword is used in shell. If expression1 is true then it executes statement 1 and 2, and this process continues. If none of the condition is true then it processes else part.
When to use nested IF in shell script?
If none of the condition is true then it processes else part. if..then..else..if..then..fi..fi.. (Nested if) Nested if-else block can be used when, one condition is satisfies then it again checks another condition. In the syntax, if expression1 is false then it processes else part, and again expression2 will be check.
How to use if, else and Elif statements?
How to Use If, else and elif statements in Shell Scripting IF, ELSE or ELIF (known as else if in other programming) are conditional statements which are used for execution of different-2 programmes depends on output true or false. All the if statements are started with then keyword and ends with fi keyword.