![]() $ java -version 2>&1 | grep -q "OpenJDK" & echo "It is OpenJDK." || echo "It is NOT OpenJDK."Īs we can see, it detects OpenJDK correctly. Under the Download menu, click the Download link corresponding your requirement. OpenJDK 64-Bit Server VM (build 17.0.3+3, mixed mode) Access Java SE Downloads page and click Accept License Agreement. OpenJDK Runtime Environment (build 17.0.3+3) VisualVM has also been distributed in Oracle JDK 68 as Java VisualVM. Standalone tool runs on any compatible JDK, component is configured to run using the host GraalVM. Both are the same bits with the same features. First, let’s run it against an OpenJDK installation: $ java -version VisualVM is distributed as a standalone tool at GitHub, and as an optional component of the GraalVM. Now, let’s test our solution on different Java environments and see if it works as expected. Therefore, we can build a command to check whether the JDK provider is OpenJDK or not: java -version 2>&1 | grep -q "OpenJDK" & echo "It is OpenJDK." || echo "It is NOT OpenJDK." Only if it succeeds (exit code = 0 ) will CMD2 start. In the example above, CMD1 gets executed first. Let’s understand the operators through a quick example: CMD1 & CMD2 || CMD3 We can make use of the exit code and conditionally concatenate multiple commands using the & and the || operators. $ echo "Java is amazing!" | grep -q 'Java' Otherwise, it returns with the exit code 0: $ echo "Kotlin is amazing!" | grep -q 'Java' But, if the given pattern is not matched, the grep command exits with code 1. ![]() When we pass the -q option to the grep command, grep will output nothing. ![]()
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