eshell-needs-pipe

eshell-needs-pipe is a variable defined in `esh-proc.el'.
Its value is

("bc")

Documentation:
List of commands which need `process-connection-type' to be nil.
Currently only affects commands in pipelines, and not those at
the front. If an element contains a directory part it must match
the full name of a command, otherwise just the nondirectory part must match.