as

    as [options]files

Generate an object file from each specified assembly language source file. Object files have the same rootname as source files but replace the .s suffix with .o. as is usually called by compiler driver programs such as cc or gcc.

Each system has options specific to it, often too many options to comprehend easily. See your local as(1) manpage.

Solaris: as is found in /usr/ccs/bin.