[R] Identifying presence of Java
||@her @end|ng |rom p|e@@th@n@com
Sat Nov 9 17:51:43 CET 2019
OSX and Windows
I want to identify if Java is installed on a particular computer.
When I execute
in a terminal (OSX), but not in R, there are two outcomes:
Java installed yields:
java version "13.0.1" 2019-10-15
Java(TM) SE Runtime Environment (build 13.0.1+9)
Java HotSpot(TM) 64-Bit Server VM (build 13.0.1+9, mixed mode, sharing)
Java not installed yields:
No Java runtime installed
I assume that there are comparable outputs in Windows.
I would like to capture this output in R using the system command, then search for “No Java runtime installed” )or the correponding text in Windows).
I execute something like:
CAPTURE <- system("Java -version", intern=TRUE, ignore.stderr=FALSE, ignore.stdout=FALSE)
(with various permutations of TRUE/FALSE for the options) but I cannot capture what is displayed on the console.
I have also tried “system2” with various TRUE/FALSE permutations without success.
Any clever ideas?
Dennis Fisher MD
P < (The "P Less Than" Company)
Phone / Fax: 1-866-PLessThan (1-866-753-7784)
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