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How do you execute a IF statement?
The if statement starts with the if keyword followed by the conditional expression and the then keyword. The statement ends with the fi keyword. If the TEST-COMMAND evaluates to True , the STATEMENTS gets executed. If TEST-COMMAND returns False , nothing happens; the STATEMENTS get ignored.
Is an if statement a command?
Remarks. If the condition specified in an if clause is true, the command that follows the condition is carried out. If the condition is false, the command in the if clause is ignored and the command executes any command that is specified in the else clause.
How do you write an IF command in Linux?
if is a command in Linux which is used to execute commands based on conditions. The ‘if COMMANDS’ list is executed. If its status is zero, then the ‘then COMMANDS’ list is executed.
What is in bash if statement?
In Bash, the if statement is part of the conditional constructs of the programming language. The if in a Bash script is a shell keyword that is used to test conditions based on the exit status of a test command. An exit status of zero, and only zero, is a success, i.e. a condition that is true.
What happens after the if in the command line?
Specifies the command to carry out if the condition is met. Command can be followed by ELSE command that will execute the command after the ELSE keyword if the specified condition is FALSE. The ELSE clause must occur on the same line as the command after the IF.
What happens if the if statement is not executed?
If so, then it echo’s a string to the command prompt. Since the condition of the second ‘if’ statement evaluates to false, the echo part of the statement will not be executed. The above command produces the following output.
When do you use the if command in Windows?
The if command is an internal command accessed and used in batch files. Windows 95. Windows 98. Windows NT. Windows XP. Windows 2000.
When to use the if command in batch files?
Availability The if command is an internal command accessed and used in batch files. IF [NOT] ERRORLEVEL number command IF [NOT] string1==string2 command The ELSE clause must occur on the same line as the command after the IF. For example: IF EXIST filename. (