| file.show {base} | R Documentation |
Display one or more files.
file.show(..., header = rep("", nfiles),
title = "R Information",
delete.file = FALSE, pager = getOption("pager"),
encoding = "")
... |
one or more character vectors containing the names of the files to be displayed. Paths with have tilde expansion. |
header |
character vector (of the same length as the number of files
specified in |
title |
an overall title for the display. If a single separate
window is used for the display, |
delete.file |
should the files be deleted after display? Used for temporary files. |
pager |
the pager to be used: not used on all platforms |
encoding |
character string giving the encoding to be assumed for the file(s). |
This function provides the core of the R help system, but it can be
used for other purposes as well, such as page.
How the pager is implemented is highly system-dependent.
The basic Unix version concatenates the files (using the headers) to a
temporary file, and displays it in the pager selected by the
pager argument, which is a character vector specifying a system
command to run on the set of files. The ‘factory-fresh’
default is to use ‘R_HOME/bin/pager’, which is a shell script
running the command specified by the environment variable PAGER
whose default is set at configuration, usually to less. On a
Unix-alike more is used if pager is empty.
Most GUI systems will use a separate pager window for each file, and
let the user leave it up while R continues running. The selection of
such pagers could either be done using special pager names being
intercepted by lower-level code (such as "internal" and
"console" on Windows), or by letting pager be an R
function which will be called with arguments (files, header,
title, delete.file) corresponding to the first four arguments of
file.show and take care of interfacing to the GUI.
The R.app Mac OS X GUI uses its internal pager irrespective
of the setting of pager.
Not all implementations will honour delete.file. In
particular, using an external pager on Windows does not, as there is
no way to know when the external application has finished with the
file.
Ross Ihaka, Brian Ripley.
files,
list.files,
help.
file.show(file.path(R.home("doc"), "COPYRIGHTS"))