The following commands will return a true value (exit code of 0) if you are using an instruction set that the command name indicates.
sun True if you are on a Sun system.
iAPX286 True if you are on a computer using an iAPX286 processor.
i386 True if you are on a computer using an iAPX386 processor.
True if you are on a PDP-11/45™ or PDP-11/70™.
sparc True if you are on a computer using a SPARC-family processor.
u3b True if you are on a 3B20 computer.
u3b2 True if you are on a 3B2 computer.
u3b5 True if you are on a 3B5 computer.
u3b15 True if you are on a 3B15 computer.
vax True if you are on a VAX-11/750™ or VAX-11/780™.
u370 True if you are on an IBM® System/370™ computer.
The commands that do not apply will return a false (non-zero) value. These commands are often used within makefiles (see make(1S)) and shell scripts (see sh(1)) to increase portability.
See attributes(5) for descriptions of the following attributes:
|ATTRIBUTE TYPE||ATTRIBUTE VALUE|
make(1S), sh(1), test(1), true(1), uname(1), attributes(5)
The machid family of commands is obsolete. Use uname -p and uname -m instead.