What is Fi in if statement?
fi allows to make choice based on the success or failure of a command. For example, find out if file exists (true condition) or not (false condition) and take action based on a condition result.
How do you write if else in shell script?
If specified condition is not true in if part then else part will be execute. 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.
Does bash have if else?
Bash allows you to nest if statements within if statements. You can place multiple if statements inside another if statement.
What does fi mean in bash script?
fi fi. 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”.
What is the fi command?
The fi command files the current item, saving all changes made. Control returns to TCL or to the next item in the active list. Overwrites any existing item with the same name on a specified file. …
What is $1 UNIX script?
$1 is the first command-line argument passed to the shell script. Also, know as Positional parameters. $0 is the name of the script itself (script.sh) $1 is the first argument (filename1) $2 is the second argument (dir1)
What does Elif mean in bash?
ELSE
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.
What is the meaning of $0?
Purpose. $0 expands to the name of the shell or shell script. This is set at shell initialization. If bash is invoked with a file of commands, $0 is set to the name of that file.
How do you use IF_THEN_ELSE_if_ then_Fi_Fi in shell script?
Working of if_then_else_if_then_fi_fi (Nested if) in Shell Scripting: In nested if condition, we can validate the multiple “if-else” conditions. The interpreter will validate the first condition of the “if_else”. If the condition is true then the further “if_else” condition will validate.
What is the if-else statement in Unix?
Unix / Linux Shell – The if…else…fi statement. The if…else…fi statement is the next form of control statement that allows Shell to execute statements in a controlled way and make the right choice.
What is the syntax of if statement in shell script?
Syntax. if [ expression ] then Statement (s) to be executed if expression is true else Statement (s) to be executed if expression is not true fi. The Shell expression is evaluated in the above syntax. If the resulting value is true, given statement (s) are executed. If the expression is false, then no statement will be executed.
What is the if-elif-FI statement?
The if…elif…fi statement is the one level advance form of control statement that allows Shell to make correct decision out of several conditions.