loadhistory(file = ".Rhistory")
savehistory(file = ".Rhistory")
history(max.show = 25, reverse = FALSE, pattern, ...)
timestamp(stamp = date(), prefix = "##------ ", suffix = " ------##", quiet = FALSE)Inf will
give all of the currently available history.grep when doing
the matching.TRUE, suppress printing timestamp to the console. windows
The functions described here work in Rgui and interactive
Rterm but not in batch use of Rterm nor in
embedded/DCOM versions.
The history mechanism is
unix
The functions described here work on Unix-alikes under the
readline command-line interface but may not otherwise (for
example, in batch use or in an embedded application). Note that R
can be built without readline.
R.app, the console on OS X, has a separate and largely
incompatible history mechanism, which by default uses a file
‘.Rapp.history’ and saves up to 250 entries. These functions are
not currently implemented there.
The readline history mechanism
is controlled by two environment variables: R_HISTSIZE controls
the number of lines that are saved (default 512), and R_HISTFILE
(default ‘.Rhistory’) sets the filename used for the
loading/saving of history if requested at the beginning/end of a
session (but not the default for
loadhistory/savehistory). There is no limit on the
number of lines of history retained during a session, so setting
R_HISTSIZE to a large value has no penalty unless a large file
is actually generated.
These environment variables are read at the time of saving, so can be
altered within a session by the use of Sys.setenv.
unix
Note that readline history library saves files with permission
0600, that is with read/write permission for the user and not
even read permission for any other account.
The timestamp function writes a timestamp (or other message)
into the history and echos it to the console. On platforms that do not
support a history mechanism only the console message is printed.