- POSIX is a standard that defines operating system interfaces that ensures software compatibility across various os’s. The goal here is to enable interop between POSIX compliant systems.
- It is based on the UNIX operating system.
- POSIX defines many interfaces:
- Shell and utilities: It defines the shell syntax and basic utilities like ls, cp, grep etc. and features such as pipes and redirect.
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- System calls: defines a set of system calls that enables programs to utilize system resources like IO, process management.
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- Library functions: defines a set of library functions that are available for application development. file manipulation, networking etc.
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- FS: file permissions, file operations, structure.
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