noao. The entire contents of all directories other than
devare fully portable, and are identical in all installations of IRAF sharing the same version number.
bin - the IRAF BIN directories dev - device tables (termcap, graphcap, etc.) doc - assorted IRAF manuals lib - the system library; global files local - iraf login directory; locally added software math - sources for the mathematical libraries noao - packages for NOAO data reduction pkg - the IRAF applications packages sys - the virtual operating system (VOS) unix - the UNIX host system interface (HSI = kernel + bootstrap utilities)
unixdirectory (host system interface) are as follows:
as - assembler sources bin - the HSI BIN directories boot - bootstrap utilities (mkpkg, rtar, wtar, etc.) gdev - graphics device interfaces (SGI device translators) hlib - host dependent library; global files os - OS interface routines (UNIX/IRAF kernel) reboot - executable script run to reboot the HSI shlib - shared library facility sources sun - gterm and imtool sources (SunView) x11 - saoimage and other X11 sourcesIf you will be working with the system much at the system level, it will be well worthwhile to spend some time exploring these directories and gaining familiarity with the system.