Advanced Programming in the UNIX Environment

Advanced Programming in the UNIX Environment by W. Richard Stevens is a classic, authoritative reference for system-level UNIX programming in C. It covers over 200 UNIX and POSIX system calls and library functions, with clear examples illustrating how each works in practice. The book blends theory with hands-on code, walking readers through building real programs like a shell, a database library, and a pseudo-terminal controller. It’s valued not only as a teaching text, but also as a reference you return to when dealing with low-level I/O, process control, signals, file systems, and interprocess communication.