* net/tramp-sh.el (tramp-remote-process-environment): Remove HISTFILE and HISTSIZE; it's too late to set them here. Add :version entry. (tramp-open-shell): Do not let-bind `tramp-end-of-output'. Add "HISTSIZE=/dev/null" to the shell's env arguments. Do not send extra "PSx=..." commands. (tramp-maybe-open-connection): Setenv HISTFILE to /dev/null.
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