* lisp/net/tramp-sh.el (tramp-do-file-attributes-with-stat):
Simplify shell command. Suppress errors (interpret as nil).
(tramp-sh-handle-make-process): Do not visit with
`insert-file-contents'. Delete tmp file only if exists.
(tramp-send-command-and-read): Suppress `signal-hook-function'
when reading expression.