file.show(..., header = rep("", nfiles), title = "R Information", delete.file = FALSE, pager = getOption("pager"), encoding = "")...) giving a header for each file being
displayed. Defaults to empty strings.title will be used as the window
title. If multiple windows are used, their titles should combine the title
and the file-specific header.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 (a full path or a command found on the PATH) 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-line
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 GUI on OS X 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.
files, list.files,
help;
RShowDoc call file.show() for type =
"text". Consider getOption("pdfviewer") and
e.g., system for displaying pdf files.file.show(file.path(R.home("doc"), "COPYRIGHTS"))
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