ol - Man Page

an Owl Lisp compiler and interpreter


ol [options] [path] ...


Owl Lisp is a purely functional variant of R7RS Scheme. Ol can be used to evaluate programs interactively and compile them to native binaries via C.


This program follows the usual GNU command line syntax, with long options starting with two dashes (`-'). A summary of essential command line flats options is included below. The complete list is shown on the help page.

-h,  --help

Show summary of options.

-v,  --version

Show version of program.

-e,  --eval string

Evaluate the string, print it's value, and exit with 0 unless errors occurred.

-t,  --test string

Evaluate the string and exit with 1 if the value is #false, 0 if it's true, or 126 if there is an error.

-o,  --output output-file

Compile the given file to fasl or C code, and save the result to the given output file.

-r,  --run path

Load the file silently, and call the last value with the remaining command line arguments.

-x,  --output-format format

Choose what ol should compile the given input to. Valid options are currently c and fasl. This is normally deduced from the file suffix given in -o, and is thus not usually needed.

-O0,  -O1,  -O2

Write plain bytecode, compile some common functions to C or everything possible. These only make sense when compiling to C.

-l,  --load path

Resume execution of program state saved with suspend.


Make a simple binary

$ echo '(lambda (args) (for-each print args))' > test.l
$ ol -o test.c test.l
$ gcc -o test test.c
$ ./test foo bar

Compile in a pipe

$ echo '(lambda (args) (print (cons "I got " args)))' | ol -x c -o - | gcc -x c -o test - && ./test 11 22 33

Loading vs running files

$ echo '(print "Hello, world!")' > test.l
$ ol test.l
Hello, world!
$ echo '(lambda (args) (print "Hello, world!"))' > test.l
$ ol --run test.l arg1 arg2 arg3
Hello, world!

See Also



Owl Lisp and this manual page were written by Aki Helin <aki.helin@iki.fi>.

Referenced By


May 31, 2018