as

Portable GNU assembler. Primarily intended to assemble output from gcc to be used by ld. More information: https://keith.github.io/xcode-man-pages/as.1.html.

as path/to/file.s

as path/to/file.s -o path/to/output_file.o

as -f path/to/file.s

as -I path/to/directory path/to/file.s