Redirect java -version to file or variable

Question

Maybe it is a silly question, but I\'m trying to redirect the exit of \"java -version\" command to a file or variable but it doesn\'t work.

Server = Linux CentOS 6<

Answer 1

java -version writes to stderr (fileno 2), not stdout (fileno 1). You can redirect stderr to a file:

java -version 2> test.txt
# cat test.txt 
# java version "1.7.0_25"
# OpenJDK Runtime Environment
# [...]

Or you can redirect stderr to stdout:

java_check=$(java -version 2>&1)
# echo "$java_check"
# java version "1.7.0_25" OpenJDK Runtime Environment [...]