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Any section(S1) Executable programs or shell commands (S2) System calls (functions provided by the kernel) (S3) Library calls (functions within system libraries) (S4) Special files (usually found in /dev) (S5) File formats and conventions eg /etc/passwd (S6) Games (S7) Macro packages and conventions eg man(7), groff(7) (S8) System administration commands (usually only for root) (S9) Kernel routines [Non standard]