POSIX defines the application programming interface (API), along with command line shells & utility interfaces, for software compatibility with variants of Unix It gained popularity with the publication of The UNIX Programming . ksh88 from the year of its introduction) was used as a basis for the POSIX shell standard.Consider a Bourne shell script that is identified by the path "some/path/to/foo" & that For this reason & because POSIX does not standardize path names, Bourne shell, Yes since SVr2, Yes (via trap), No, No, Since SVr2, No, No, No, Yes , No, No. POSIX shell, Yes, Yes (via trap)

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