Capital of Statistics » R Language

  1. yihui
    Key Master

    Because we can shut down the Windows system by the command shutdown, we may also use the R function shell() to execute the command. For instance, shell("shutdown -s -t 10") will shut down your computer after 10 seconds (DON'T run the code before you have saved and closed all the programs - I'll not be responsible for your data lost!). If you regret doing so, you can execute shell("shutdown -a") immediately.

    I'm not sure whether the command is the same under Linux. (AFAIR, it's the same command but with different options?)

    We may include this function in the package fun as well:

    shutdown = function(wait = 0,  timeout = 10) {
    Sys.sleep(wait)
    # .Platform$OS.type? Windows? Linux?
    shell(sprintf("shutdown -s -t %d", timeout))
}

    I think this function can be useful when we want our computer to be shut down automatically after a (time-consuming) task.

    Posted 2 years ago #

  2. yanlinlin82
    Key Master

    Linux use the 'shutdown' command too, but with different parameters.

    We can use following command to shutdown immediately:
    $ shutdown -h now
    Or following command to shutdown after 30 minutes:
    $ shutdown -h +30
    Or shutdown at 23:30:
    $ shutdown -h 23:30

    So the function can be:

    shutdown = function(wait = 0, timeout = 10) {
  Sys.sleep(wait)
  shell(
    paste(sep = "",
      "shutdown ",
      switch(.Platform$OS.type,
        windows = sprintf("-s -t %d", timeout),
        unix = "-h now")
      )
    )
}
shutdown()
    Posted 2 years ago #

  3. Taiyun
    Moderator

    Cool, Wonderful job!

    Posted 2 years ago #

  4. yihui
    Key Master

    I realized the argument timeout is unnecessary, so this will be enough:

    shutdown <-
function(wait = 0) {
    Sys.sleep(wait)
    ifelse(.Platform$OS.type == "windows", shell("shutdown -s -t 0"),
        system("shutdown -h now"))
}

    This function has gone to fun now. You can see it in R-Forge.

    Posted 2 years ago #

  5. sanjidao01
    Member

    thanks very much!! it s very helpful for me
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    Posted 2 years ago #

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