How to unlink one specific binary

[Greg-Myers-SB]

Output of brew config

$ brew config
HOMEBREW_VERSION: 4.2.21
ORIGIN: https://github.com/Homebrew/brew
HEAD: 82c2e743a5bcea725f9ca1429e3e21c3088ff904
Last commit: 2 days ago
Core tap HEAD: 50293fa34aae8e3cb0f630ff67e45545d3822a80
Core tap last commit: 29 hours ago
Core tap JSON: 07 May 08:54 UTC
Core cask tap HEAD: 8306a10cb99f9459f16e81f040532534f129cee1
Core cask tap last commit: 28 hours ago
Core cask tap JSON: 07 May 08:54 UTC
HOMEBREW_PREFIX: /opt/homebrew
HOMEBREW_CASK_OPTS: []
HOMEBREW_DISPLAY: /private/tmp/com.apple.launchd.WKFEPAJhze/org.xquartz:0
HOMEBREW_EDITOR: vi
HOMEBREW_MAKE_JOBS: 10
HOMEBREW_NO_AUTO_UPDATE: set
Homebrew Ruby: 3.1.4 => /opt/homebrew/Library/Homebrew/vendor/portable-ruby/3.1.4/bin/ruby
CPU: 10-core 64-bit arm_firestorm_icestorm
Clang: 15.0.0 build 1500
Git: 2.44.0 => /opt/homebrew/bin/git
Curl: 8.4.0 => /usr/bin/curl
macOS: 14.4.1-arm64
CLT: 15.3.0.0.1.1708646388
Xcode: 15.0.1
Rosetta 2: false
Time: 0h:00m:03s

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```shell
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Time: 0h:00m:22s

### Description of issue

The parallel formula installs both `parallel` and `sem`, and the semaphore-ci cli also needs to install `sem`, so I have a collision.

Is it possible to unlink ONLY `sem` from parallel without unlinking parallel?

[carlocab]

You could probably do something like

brew install sem
brew unlink sem
brew install parallel
brew link --overwrite sem

So that the sem from the sem formula overwrites the sem from the parallel formula.

Unfortunately this is something you'd need to do every time one of sem or parallel is upgraded. I'd personally have use for linking only specific files from certain formulae to resolve conflicts (e.g. parallel and moreutils), but I haven't found the time to work on a better solution.

[Greg-Myers-SB]

Thank you for the suggestion, that would work for me for now. Unfortunately I installed semaphore-cli outside of brew, so for now my workflow is brew unlink parallel and return it with link parallel once I'm done with the sem cli for the day.