nim

TLDR

Compile a source file

$ nim compile [file.nim]

Compile and run a source file

$ nim compile -r [file.nim]

Compile a source file with release optimizations enabled

$ nim compile -d:release [file.nim]

Build a release binary optimized for low file size

$ nim compile -d:release --opt:size [file.nim]

Generate HTML documentation for a module (output will be placed in the current directory)

$ nim doc [file.nim]

nim command [options] [projectfile] [arguments]

compile, c: compile project with default code generator (C)
r: compile to $nimcache/projname, run with [arguments] using backend specified by `--backend` (default: c)
doc: generate the documentation for inputfile for backend specified by `--backend` (default: c)

arguments are passed to the program being run (if --run option is selected)

-p, --path:PATH: add path to search paths
-d, --define:SYMBOL(:VAL): define a conditional symbol (Optionally: Define the value for that symbol, see: "compile time define pragmas")
-u, --undef:SYMBOL: undefine a conditional symbol
-f, --forceBuild:on|off: force rebuilding of all modules
--stackTrace:on|off: turn stack tracing on|off
--lineTrace:on|off: turn line tracing on|off
--threads:on|off: turn support for multi-threading on|off
-x, --checks:on|off: turn all runtime checks on|off
-a, --assertions:on|off: turn assertions on|off
--opt:none|speed|size: optimize not at all or for speed|size Note: use -d:release for a release build!
--debugger:native: Use native debugger (gdb)
--app:console|gui|lib|staticlib: generate a console app|GUI app|DLL|static library
-r, --run: run the compiled program with given arguments
--fullhelp: show all command line switches
-h, --help: show this help
-v, --version: show detailed version information

Note, single letter options that take an argument require a colon. E.g. -p:PATH.

https://github.com/nim-lang/Nim/issues