Re: Is there a command to clear the command line buffer

[David L Lorenz <lorenz@usgs.gov>]

Douglas,
  You might consider using a pop-up
window instead of using the Commands Window to read the password. Here's
a short piece of code that should get you close:
getText <- function(Prompt = "Enter
text", title = "") {
        ##
return the text entered
        Control
<- list()
        Control[[1]]
<- editfield.control(label = Prompt, value = "", size = c(200,
10))
        Dbox
<- dialogbox(title, controls = Control, buttons = "OK")
        retval
<- dialogbox.display(Dbox)$values[[Prompt]]
        return(retval)
}

Just substitute the call to getText
for readline.
Dave

From:	"Hersh, Douglas" <Douglas.Hersh@mwra.state.ma.us>
To:	<s-news@lists.biostat.wustl.edu>
Date:	04/30/2009 09:31 AM
Subject:	Re: [S] Is there a command to clear the command line buffer
Sent by:	s-news-owner@lists.biostat.wustl.edu

---

Control over commands history can only be
controlled on a session-by-session basis by setting the S_CMDSAVE environment
variable when starting splus.exe. 
 
Kirsten Smith    
                    
Technical Support Engineer              
TIBCO Spotfire Corporation replied:
 
Currently the only way to clear
the Commands History is to close out of Spotfire S+, which I suspect you
already knew.  There is a way, however, to prevent any of the commands
to be stored to history.  There is an environment variable called
'S_CMDSAVE' that you can to any number which limits the number of commands
saved to history.

To set this, close out of S+ and right click on your shortcut icon and
click on 'Properties'.  In the Target field under the Shortcut tab
add a space at the end of the string that is already there and add S_CMDSAVE=0.
 It should look something like this:

"D:\Program Files\TIBCO\splus81\cmd\SPLUS.exe" S_CMDSAVE=0

Restart S+ and you should see that none of your commands are saved to history.

---

From: Hersh, Douglas 
Sent: Tuesday, April 28, 2009 4:38 PM
To: s-news@lists.biostat.wustl.edu
Subject: Is there a command to clear the command line buffer
 
It must be possible to clear the command
line buffer using a command at the command prompt or from a script, but
I can not find it in the documentation.
 
I have a need for users to run a script that
logs into a database to retrieve data into a dataframe, but I need some
way to keep the password from persisting on screen or in a file for security
reasons.
 
I doubt that there is any way to hide the
input to readline() as it is typed at the command line, but it would make
things more secure if I could clear the screen buffer right after importData
has finished.
 
# test.ssc
mynewdata <- importData(
type="direct-oracle",
user="DB_USER", 
password=readline(prompt="Enter password
at prompt in command window: "),
server="BIGDATABASE",
sqlQuery = "SELECT 'foo' AS foo_bar
FROM dual"
)
 
This came up 9-years ago on this list, but
it has not been answered. I opened a service request with Tibco for this.
I will post their response if I get one.
 
Thanks very much.
 
- Doug