ccs = C Compilation System, contains binaries used to build programs. This directory is deprecated in latest Solaris Express where these binaries are in /usr/bin
xpg4 = Xopen Portability Guide Issue 4, contains binaries strictly compliant with several POSIX and other standards. The differences with the former ones are usually details in options supported and behavior.
There is also /usr/xpg6/bin, /usr/openwin/bin (OpenWindows commands), /usr/dt/bin (CDE desktop commands), /usr/sfw/bin (Solaris freeware) and various other.
Solaris Express is introducing /usr/gnu/bin to provide Gnu binaries with their custom extensions and specificities.
/usr/xpg4/bin是什麼目錄？
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