CODEWITHSUNDEEP
greppipe
user6064254
user6064254

Reputation: 27

grep result is not what I want

java -version output like this:

> java -version
java version "1.8.0_101"
Java(TM) SE Runtime Environment (build 1.8.0_101-b13)
Java HotSpot(TM) 64-Bit Server VM (build 25.101-b13, mixed mode)

then I run grep command, but can't get my expected result.

>java -version | grep "version"
java version "1.8.0_101"
Java(TM) SE Runtime Environment (build 1.8.0_101-b13)
Java HotSpot(TM) 64-Bit Server VM (build 25.101-b13, mixed mode)

My expected result is just only the first line 

java version "1.8.0_101"

why ?

Upvotes: 0

Views: 31

Answers (1)

Kent
Kent

Reputation: 195229

java -version prints text to standard err, instead of standard output. so you should do:

java -version 2>&1|grep "version"

Upvotes: 1

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