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lang-bash
bash -c 'cd //; /bin/pwd', I get//. Cygwin (8.23-4) with bash version 4.1.17(9)-release and pwd (GNU coreutils) 8.23. Even more surprising, I still get//if I do/bin/pwd -P.fishdoes not do this. If you runcd //; pwd, orfish -c 'cd //; pwd', you get/, and if you run the former with a default prompt, the prompt has just 1 slash.//.