The error message " ⎕SE.Link.Create: File name case clash - try using caseCode←1:" is unhelpful to a newbie

[dyaandys]

On macOS I created foo, Foo and FOO, and then tried ]link.Create # ERRORS ENCOUNTERED: ⎕SE.Link.Create: File name case clash - try using caseCode←1: #.FOO #.Foo #.FOO #.foo

1. Why does FOO appear twice ?
2. I needed Morten to help me get to ]link.Create # -casecode .. I went via ]link.Create # -caseCode=1

• Command Execution Failed: unknown modifier: "caseCode" ]link.Create # -casecode=1
• Command Execution Failed: no value allowed for modifier

Can the error be more command line centric please ?

Dyalog 19.0.48774 64-bit Unicode, BuildID 2b135e73 OS Darwin 22.4.0 Darwin Kernel Version 22.4.0: Mon Mar 6 21:00:41 PST 2023; root:xnu-8796.101 Link 4.0.13 SALT 2.915 UCMD 2.6 .NET .NET 8.0.1 WS 19.0