The OS-layer abstraction that turns a flat block device into named, permissioned, hierarchical files — covering inodes, paths, permissions, journaling, and copy-on-write.
An operating-system primitive that streams one process's stdout into another's stdin, letting small composable tools build large data flows.
POSIX file finder with powerful expression-based filters for name, type, size, time, permissions, and ownership. Covers exec actions, pruning, and real-world recipes.
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