file.show {base}

R Documentation

Display One or More Files

Description

Display one or more files.

Usage

file.show(..., header = rep("", nfiles),
          title = "R Information",
          delete.file = FALSE, pager = getOption("pager"),
          encoding = "")

Arguments

...	one or more character vectors containing the names of the files to be displayed. These will be tilde-expanded: see path.expand.
header	character vector (of the same length as the number of files specified in ...) giving a header for each file being displayed. Defaults to empty strings.
title	an overall title for the display. If a single separate window is used for the display, title will be used as the window title. If multiple windows are used, their titles should combine the title and the file-specific header.
delete.file	should the files be deleted after display? Used for temporary files.
pager	the pager to be used.
encoding	character string giving the encoding to be assumed for the file(s).

Details

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 (usually less) to run on the set of files.

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 the same first four arguments as file.show and take care of interfacing to the GUI.

Not all implementations will honour delete.file.

Author(s)

Ross Ihaka, Brian Ripley.

See Also

files, list.files, help.

Examples

file.show(file.path(R.home("doc"), "COPYRIGHTS"))

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