Writing to a file

$text = 'Hello World'
#
# Create file:
#
$text | Set-Content 'file.txt'
#or
$text | Out-File 'file.txt'
#or
$text > 'file.txt'
#
# Append to file:
#
$text | Add-Content 'file.txt'
#or
$text | Out-File 'file.txt' -Append
#or
$text >> 'file.txt'