# as > Portable GNU assembler. > Primarily intended to assemble output from `gcc` to be used by `ld`. > More information: . - Assemble a file, writing the output to `a.out`: `as {{file.s}}` - Assemble the output to a given file: `as {{file.s}} -o {{out.o}}` - Generate output faster by skipping whitespace and comment preprocessing. (Should only be used for trusted compilers): `as -f {{file.s}}` - Include a given path to the list of directories to search for files specified in `.include` directives: `as -I {{path/to/directory}} {{file.s}}`