episodes

You type these commands every day. Watch them get rebuilt from an empty file, one system call at a time.
12 to 18 minutes per episode.

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01
episode 01 cat(1): Rebuilding cat from Scratch in C file I/O · read() · write() · POSIX
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episode 02 head(1): Rebuilding head from Scratch in C read loops · line counting · -n flag
03
episode 03 tail(1): Rebuilding tail from Scratch in C lseek() · seeking from end · reverse read