wc

This is a java implementation of the Unix core tool wc.

The cli is built using picocli and the native executable is generated using GraalVM. The executable is an arm64 binary compiled on an M1 Macbook Air 2020.

The binary generated is standalone i.e. everything required to run it, is packaged into it. Java installation of any kind (JRE, JDK, JVM etc.) is not required thanks to GraalVM native-image.

The binary can be executed just like any other command line application by simply invoking it on the command line:

>> ./wc test.txt
    7145   58164  342190 test.txt

Features

• line count
• word count
• byte count
• char count
• input from file
• input from stdin (compatible with pipes)

Building the binary

1. Clone the repo.
2. Install dependencies and plugins.

>> mvn dependency:resolve
>> mvn dependency:resolve-plugins

3. Compile and run tests.

>> mvn test

4. Generate the jar file.

>> mvn package

5. Install graalvm and make sure the native-image utility is on your path.
6. Generate the binary.

>> native-image -jar /path/to/jar

Todo

• input from multiple files