For a full answer:
PS copied many concepts from Bash and Perl. (After all it's an attempt to fix problems with cmd and bat and full of aliases to support *nix commands)
For instance
- $ as sigil for $variables
- interpolation in double-quoted strings
C:\tmp>powershell
Windows PowerShell
Copyright (C) Microsoft Corporation. Alle Rechte vorbehalten.
PS C:\tmp> $x="xxx"
PS C:\tmp> echo "a${x}b"
axxxb
PS C:\tmp> echo 'a${x}b'
a${x}b
PS C:\tmp> exit
C:\tmp>
That's why you need a single-quoted string for perl -e
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