In PowerShell, flow control statements are used to manage the execution of code based on certain conditions or to repeat actions while a condition is true. Here are some common flow control statements in PowerShell:
if, elseif, and else:
These statements are used to execute specific code blocks based on the evaluation of a condition. The 'if' keyword is followed by a condition, and the code block within the curly braces {} is executed if the condition is true. The 'elseif' statement can be used to check additional conditions, and the 'else' statement is used to execute code when none of the previous conditions are met.
if ($condition1) {
# Code to execute if condition1 is true
} elseif ($condition2) {
# Code to execute if condition2 is true
} else {
# Code to execute if none of the conditions are true
}
Switch:
The 'switch' statement is used to execute a specific code block based on the value of a variable or expression. It can be used as an alternative to multiple 'if' and 'elseif' statements.
switch ($variable) {
value1 { # Code to execute if $variable equals value1 }
value2 { # Code to execute if $variable equals value2 }
default { # Code to execute if none of the values match }
}
for:
The 'for' loop is used to execute a block of code for a specified number of iterations. It consists of three parts: an initializer, a condition, and an incrementer.
for ($i = 0; $i -lt 10; $i++) {
# Code to execute for each iteration
}
foreach:
The 'foreach' loop is used to iterate through a collection of items, executing a block of code for each item in the collection.
foreach ($item in $collection) {
# Code to execute for each item in the collection
}
while:
The 'while' loop is used to execute a block of code as long as a specified condition is true.
while ($condition) {
# Code to execute while the condition is true
}
do-while and do-until:
These loops execute a block of code at least once and then continue to execute it as long as the specified condition is true (do-while) or false (do-until).
do {
# Code to execute
} while ($condition)
do {
# Code to execute
} until ($condition)
These flow control statements enable you to create complex and powerful scripts in PowerShell by controlling the execution of code based on conditions and iteration.