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how to capture the java version on linux redhat machine

we tried that:

java -version | head -1 | awk '{print $NF}' | sed 's/"//g'

but we get

openjdk version "1.8.0_65"
OpenJDK Runtime Environment (build 1.8.0_65-b17)
OpenJDK 64-Bit Server VM (build 25.65-b01, mixed mode)

while expected output should be

1.8.0_65
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java -version outputs to its standard error, so you need to redirect that:

java -version 2>&1 | head -1 | awk '{print $NF}' | sed 's/"//g'

You can do this with a single AWK invocation:

java -version 2>&1 | awk 'NR==1 {gsub("\"", "", $NF); print $NF}'
  • we can also do it on remote machine as ssh $IP "java -version 2>&1 | head -1 | awk '{print \$NF}' | sed 's/\"//g' " – yael Apr 26 '18 at 14:30
  • well done step , this is one of the best answer I have seen – yael Apr 26 '18 at 14:36

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