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as is a generic command name for an
assembler Assembler may refer to: Arts and media * Nobukazu Takemura, avant-garde electronic musician, stage name Assembler * Assemblers, a fictional race in the ''Star Wars'' universe * Assemblers, an alternative name of the superhero group Champions of ...
on
Unix Unix (; trademarked as UNIX) is a family of multitasking, multiuser computer operating systems that derive from the original AT&T Unix, whose development started in 1969 at the Bell Labs research center by Ken Thompson, Dennis Ritchie, an ...
.


Implementations

More than one assembler for Unix and Unix-like operating systems has been implemented with an executable called as. Users may be able to determine which implementation (if any) is present on their system by consulting the system's manuals, or by running as --version.


AT&T / Bell Labs

As of November 1971, an assembler invoked as as was available for Unix. Implemented by Bell Labs staff, it was based upon the
Digital Equipment Corporation Digital Equipment Corporation (DEC ), using the trademark Digital, was a major American company in the computer industry from the 1960s to the 1990s. The company was co-founded by Ken Olsen and Harlan Anderson in 1957. Olsen was president un ...
's
PAL-11R PAL-11R is an assembly language, and an assembler, for the PDP-11's disk operating system, DOS-11. It was the precursor to MACRO-11 MACRO-11 is an assembly language with macro facilities, designed for PDP-11 minicomputer family from Digital Equi ...
assembler.


GNU Assembler

Circa 1986, the
GNU Assembler The GNU Assembler, commonly known as gas or as, is the assembler developed by the GNU Project. It is the default back-end of GCC. It is used to assemble the GNU operating system and the Linux kernel, and various other software. It is a part of ...
("GAS") became available. As with the original UNIX assembler, GAS's executable is simply named as. As of 2018, GAS implements many features that were not present in the 1971 Bell Labs implementation.


References

Assemblers Unix programming tools {{Unix-stub