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[ ! ! hey ] -> [: too many arguments

From: Steffen Nurpmeso
Subject: [ ! ! hey ] -> [: too many arguments
Date: Thu, 23 Jun 2022 15:39:46 +0200
User-agent: s-nail v14.9.24-259-ge9cf982228


I stumbled over a bug in the MUA i maintain, and when checking
against what shells do with lonely unary ! i then came to this:

  #?0|kent:tmp$ dash -c 'if [ ! ! hey ]; then echo du; fi'
  #?0|kent:tmp$ bash -c 'if [ ! ! hey ]; then echo du; fi'
  bash: line 1: [: too many arguments
  #?0|kent:tmp$ busybox.static sh -c 'if [ ! ! hey ]; then echo du; fi'

(The single ! that my MUA bails on seems to be handled
identically by shells.)

|Der Kragenbaer,                The moon bear,
|der holt sich munter           he cheerfully and one by one
|einen nach dem anderen runter  wa.ks himself off
|(By Robert Gernhardt)

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