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by SAI_Peregrinus
29 days ago
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POSIX specifies a common subset of functionality of several different shells (and C libraries) that existed when it was created, and that any compliant shell (or C library) will share. Some functions like `echo` are guaranteed to be present but don't have fully-specified behavior, because the shells that POSIX was created to be the common functional subset of had different behaviors when POSIX was created. POSIX doesn't guarantee portability. POSIX only guarantees that the things it specifies will work in a POSIX-compliant environment. POSIX makes no guarantees about portability to non-POSIX-compliant environments like Windows' shells or MSVC, the Fish shell, etc. POSIX makes no guarantees about the things it doesn't specify. |
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