Tag [`ps1`][1] has [no guidance][2], with only 44 questions using it, however the main problem is `.ps1` is a PowerShell [profile][3] and [script][4] extension, but is being used both for PowerShell and other shells that really aren't relevant to it:
  - While BSD/Linux shells do use the `PS1` variable within their shell RC files, it's so widely attributed with PowerShell even syntax highlighter highlight.js [uses][5] `ps1` for PowerShell _(which will be a supported code syntax on this site when it's eventually [added][6] and that oversight bug fixed)_

If the `ps1` tag should be used, it would make far more sense for BSD/Linux shell `PS1` variable questions to be tagged with their shell and shell config tags, not tag `ps1`, and for this guidance to be within the tag's guidance.


  [1]: https://superuser.com/questions/tagged/ps1
  [2]: https://superuser.com/edit-tag-wiki/11362
  [3]: https://learn.microsoft.com/en-us/powershell/module/microsoft.powershell.core/about/about_profiles#profile-types-and-locations
  [4]: https://learn.microsoft.com/en-us/powershell/module/microsoft.powershell.core/about/about_scripts
  [5]: https://github.com/highlightjs/highlight.js/blob/main/SUPPORTED_LANGUAGES.md
  [6]: https://meta.superuser.com/questions/15158/what-is-going-on-with-this-sites-syntax-highlighting