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Why this exists A tool that behaves like the standard ones (grep, wc) follows a few conventions: flags before arguments, h for help, input from a file or a pipe, results on standard output and problems on standard…
A Real Command-Line Tool with getopt, Standard Input and Exit Codes
Turn a scanner into a proper Unix tool: options parsed with getopt, a usage message, reading from a file or standard input, results to stdout, errors to stderr, and a clean structure with a small main.
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