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lang-bash
s="${s//\$HOME/$HOME}"is a substitution parameter expansion. So anytime the variableacontains the substring$HOMEthen replace it with the expanded value of$HOME.s. So that when it gets used in the parameter expansion i.e.${s//PATTERN_TO_FIND/REPLACE_STRING}it causes you to say "hey that looks like a common form of a substitution expression" when you see it in amongst the rest of the scriptprintenvshows (which is all the exported variables).