Hello,
I have a system command that occasionally fails and writes output to
standard error, which R will print to the screen when ignore.stderr =
FALSE.
For example:
> system("BadCommand")
sh: line 1: BadCommand: command not found
I would like to know if the above command fails, and can presumably do
this by parsing the stderr message that R prints to the screen. My
(hopefully simple) problem is that I can't figure out how to capture
this output.
I tried intern = TRUE, capture.output, and sink (with either/both type =
"message" and type = "output"). I'm perplexed why sink doesn't get this
output (since it's printed to the screen), so wanted to ask the R
community how to grab the error message generated by trying to run
"BadCommand".
To be clear, below is the sink() syntax I tried. Notice the output of
the sink is character(0) rather than the line "sh: line 1: BadCommand:
command not found".
> conn <- sink(z <- tempfile())
> sink(conn, type = "message")
> system("BadCommand")
sh: line 1: BadCommand: command not found
> sink(type = "message")
> sink()
> readLines(z)
character(0)
Thanks in advance,
Robert
> R.version
_
platform i686-pc-linux-gnu
arch i686
os linux-gnu
system i686, linux-gnu
status Patched
major 2
minor 3.1
year 2006
month 07
day 27
svn rev 38721
language R
version.string Version 2.3.1 Patched (2006-07-27 r38721)
Robert McGehee
Quantitative Analyst
Geode Capital Management, LLC
53 State Street, 5th Floor | Boston, MA | 02109
Tel: 617/392-8396 Fax:617/476-6389
mailto:[EMAIL PROTECTED]
This e-mail, and any attachments hereto, are intended for us...{{dropped}}
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