Escaping dollar signs in PowerShell path is not working

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Instead of messing around with escaping dollar signs, use single quotes ' instead of double quotes ". It prevents PowerShell expanding $ into a variable. Like so,

$p = "C:\temp\Share\ISO$OEM$"
# Output
C:\temp\Share\ISO$


$p = 'C:\temp\Share\ISO$OEM$'
# Output
C:\temp\Share\ISO$OEM$

If you need to create a path by using variables, consider using Join-Path. Like so,

$s = "Share"
join-path "C:\temp\$s" '\ISO$OEM$' 
# Output
C:\temp\Share\ISO$OEM$

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