You'd be surprised at how god-damn much those command line tools actually do.
If you open up a manpage for ls on mac, you’ll see that it starts with
ls [-ABCFGHLOPRSTUW@abcdefghiklmnopqrstuwx1] [file ...]
That is, the one-letter flags to ls include every lowercase letter except for {jvyz}, 14 uppercase letters, plus @ and 1. That’s 22 + 14 + 2 = 38 single-character options alone.
This is an idiom which sounds nice but cannot be applied, due to the underspecificity of both "one thing" and "well". It is as meaningless as the following function signature:
f::a
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A function (or method) should do one thing, and do it well.
I like seeing this applied on the macro level too. ie keeping a command line tool specialised to doing one specific task very well.
You'd be surprised at how god-damn much those command line tools actually do.
Also Google's rule for browser extensions, each extension should do one thing.
This is an idiom which sounds nice but cannot be applied, due to the underspecificity of both "one thing" and "well". It is as meaningless as the following function signature: