TRUE
when R is being used interactively and
FALSE
otherwise.
interactive()
GUI consoles will arrange to start R in an interactive session. When
R is run in a terminal (via Rterm.exe
on Windows), it
assumes that it is interactive if stdin is connected to a
(pseudo-)terminal and not if stdin is redirected to a file or
pipe. Command-line options --interactive (Unix) and
--ess (Windows, Rterm.exe
) override the default
assumption.
unix
(On a Unix-alike, whether the readline
command-line editor is
used is not overridden by --interactive.)
Embedded uses of R can set a session to be interactive or not.
Internally, whether a session is interactive determines
stop
and options("showWarnCalls")
.
dev.new
: see options("device")
In addition, R's own R code makes use of interactive()
: for
example help
, debugger
and
install.packages
do.
source
,
.First
.First <- function() if(interactive()) x11()
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