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| -rw-r--r-- | README | 9 |
1 files changed, 7 insertions, 2 deletions
@@ -19,8 +19,13 @@ See the file NEWS for a list of major changes in the current release. See the file INSTALL for compilation and installation instructions. -These programs are intended to be POSIX.2 compliant (with BSD and other -extensions), like the rest of the GNU system. +These programs are intended to conform to POSIX (with BSD and other +extensions), like the rest of the GNU system. By default they conform +to older POSIX (1003.2-1992), and therefore support obsolete usages +like "head -10" and "chown owner.group file". This default is +overridden at build-time by the value of <unistd.h>'s _POSIX2_VERSION +macro, and this in turn can be overridden at runtime as described in +the documentation under "Standards conformance". The ls, dir, and vdir commands are all separate executables instead of one program that checks argv[0] because people often rename these |