Java
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Why this exists A tool is only useful in a pipeline if scripts can rely on it: it takes arguments, reads from a file or a pipe, writes results to standard output and problems to standard error, and tells the caller…
Command-Line Tools in Java: Arguments, Environment Variables, System Properties, Standard Input and Exit Codes
Write a Java program that behaves like a proper Unix tool: parse options, read files or standard input, take settings from the environment and -D properties, print results to stdout and problems to stderr, and report success through the exit code.
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