CMD & PowerShell Scripting Pitfalls FAQs

Question 1

How does this skill handle UTF-8 encoding differences between PowerShell 5.1 and 7+?

Accepted Answer

Windows PowerShell 5.1 defaults to the system active code page or writes a UTF-8 BOM when -Encoding UTF8 is used, whereas PowerShell 7+ defaults to UTF-8 without BOM. This skill guides the explicit use of .NET APIs like [IO.File]::WriteAllText with specific encoding objects to ensure consistent, cross-version file output without encoding corruption.

Question 2

What is the recommended way to invoke PowerShell commands from a CMD script?

Accepted Answer

When invoking PowerShell from CMD, avoid using backslash-escaped double quotes inside outer double quotes, as CMD does not recognize them. Instead, use single quotes inside PowerShell commands or place complex logic into standalone .ps1 files with explicit parameters and return exit codes via $LASTEXITCODE.

Question 3

Why does my CMD batch script crash inside a for loop that prints parentheses?

Accepted Answer

In CMD batch scripts, unescaped closing parentheses inside a parenthesized block (such as a for loop or if statement) are treated by the parser as block terminators. You must escape literal closing parentheses using a caret (^) or isolate the logic to prevent early termination of the block.

Question 4

How does this skill prevent MSYS2 and Git Bash from mangling Windows CLI arguments?

Accepted Answer

MSYS2 runtime automatically converts POSIX-like paths into Windows paths, which can corrupt Windows CLI flags (like /path or -prefix). The skill guides you to use the MSYS2_ARG_CONV_EXCL environment variable with narrow prefix filters to selectively bypass argument conversion without breaking genuine path resolution.

CMD & PowerShell Scripting Pitfalls

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