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This article explains three common Linux commands—ls, du, and stat—for checking file sizes, showing the exact syntax, example usage with a sample file, and how each command displays size information, including human‑readable formats.
This article explains why Linux utilities like du and ls can report dramatically different file sizes, introduces the concept of sparse files, and shows practical commands to identify and correctly handle them on Unix-like systems.
The article explains that the ls command becomes slow on directories containing millions of files because it repeatedly calls the getdents system call through readdir, and demonstrates how directly using getdents with a larger buffer can reduce the listing time from several seconds to under one second.