arch displays the application architecture of the current host system.
Sun systems can be broadly classified by their architectures, which define what executables will run on which machines. A distinction can be made between kernel architecture and application architecture (or, commonly, just ``architecture''). Machines that run different kernels due to underlying hardware differences may be able to run the same application programs. For example, the MC68020-based Sun-3/160 system and the MC68030-based Sun-3/80 system run different SunOS kernels, but can execute the same applications. These machines could be described as having ``the same application architecture'' but ``different kernel architectures.''
Executing arch will display the application architecture of the machine, such as sun3, sun4, etc. All machines of the same application architecture will execute the same application programs, or user binaries.
+--------------------------------------------------------------+ |Application Kernel Current Sun System Models | |Architecture Architecture | +-------------+--------------+---------------------------------+ |sun3 | sun3 | 3/50, 3/60, 3/75, 3/110, 3/140, | | | | 3/160, 3/180, 3/260, 3/280 | +-------------+--------------+---------------------------------+ |sun3 | sun3x | 3/80, 3/460, 3/470, 3/480 | +-------------+--------------+---------------------------------+ |sun4 | sun4 | 4/110, 4/260, 4/280, | | | | SPARCsystem 300 series, | | | | SPARCsystem 400 series | +-------------+--------------+---------------------------------+ |sun4 | sun4c | SPARCsystem 1, SPARCsystem 1+, | | | | SPARCsystem 2, SPARCsystem IPC, | | | | SPARCsystem SLC | +-------------+--------------+---------------------------------+ |sun4 | sun4m | SPARCsystem 600MP series | +-------------+--------------+---------------------------------+ |sun386 | sun386 | 386i/150, 386i/250 | +-------------+--------------+---------------------------------+
[a manual with the abbreviation INSTALL]
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