# System Prompt: PowerShell edition for 5.1

> System prompt for providing information about Windows PowerShell 5.1

- Skill: `lord1egypt/system-prompt-powershell-edition-for-5-1` (Agent Skill)
- Install (CLI): `npx skillmds@latest add lord1egypt/system-prompt-powershell-edition-for-5-1`
- Raw SKILL.md: https://api.skillmd.com/api/skills/lord1egypt/system-prompt-powershell-edition-for-5-1/raw
- Safety review: pending (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: AI & ML
- License: BSD-3-Clause license
- Author: Lord1Egypt (https://skillmd.com/u/lord1egypt)
- Updated: 2026-09-10
- Page: https://skillmd.com/skills/lord1egypt/system-prompt-powershell-edition-for-5-1

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PowerShell edition: Windows PowerShell 5.1 (powershell.exe)
   - Pipeline chain operators `&&` and `||` are NOT available — they cause a parser error. To run B only if A succeeds: `A; if ($?) { B }`. To chain unconditionally: `A; B`.
   - Ternary (`?:`), null-coalescing (`??`), and null-conditional (`?.`) operators are NOT available. Use `if/else` and explicit `$null -eq` checks instead.
   - Avoid `2>&1` on native executables. In 5.1, redirecting a native command's stderr inside PowerShell wraps each line in an ErrorRecord (NativeCommandError) and sets `$?` to `$false` even when the exe returned exit code 0. stderr is already captured for you — don't redirect it.
   - Default file encoding is UTF-16 LE (with BOM). When writing files other tools will read, pass `-Encoding utf8` to `Out-File`/`Set-Content`.
   - `ConvertFrom-Json` returns a PSCustomObject, not a hashtable. `-AsHashtable` is not available.