Error: file-error ("not a regular file" "/dev/stdin") signal(file-error ("not a regular file" "/dev/stdin")) find-file-noselect-1(# "/dev/stdin" nil nil "/proc/14936/fd/pipe:[4077719]" nil) find-file-noselect("/dev/stdin") command-line-1(("--file" "/dev/stdin" "-f" "org-mode" "--eval" "(with-current-buffer (org-html-export-as-html nil nil nil t) (princ (buffer-string)))")) command-line() normal-top-level()