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Core file operations, text processing, I/O redirection, searching with grep, links & archives, and system documentation. The foundation for every other domain.
Create, copy, move, and remove files and directories. Inspect file metadata with stat, identify types with file, and locate files with find.
Display file contents with cat/head/tail, count lines with wc, compare files with diff, and transform text with sort and cut.
Redirect stdout/stderr with >, >>, 2>, and &>. Chain commands with pipes (|) and split output with tee.
Search file contents with grep -i/-r/-E, use basic and extended regular expressions, and find files by name or type with find.
Create hard links and symbolic links with ln. Archive and compress with tar -czf/-xzf/-tjf.
Look up command help with man and --help. Locate binaries with which and check system info with uname.