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Armed Bear Common Lisp

abcl

Armed Bear Common Lisp (ABCL) is a full implementation of the Common Lisp language featuring both an interpreter and a compiler in the JVM.

Runs as abcl|macOS, Linux, Windows|abcl.org

Open form in Otty otty.toml

Command form

ai-draft · 2 tasks · 5 fields

Start the Armed Bear Common Lisp REPL, or evaluate an expression or load a file first. Other startup switches are left out.

Opens the form; the finished command lands at your prompt, unrun

Run in Otty

otty gui abcl

Start ABCLExample values, fixed in this page — nothing here reaches a terminal

Basic

Load file*

file

Batch mode

--batch

Advanced

Skip init file

--noinit

Hide startup banner

--noinform

TasksEach one presets the form for one job

Run a Lisp file

loadnoinitnoinformbatch

Evaluate an expression

evalnoinformbatch

ParametersOnly these flags are editable in the form

Evaluate expression

string · repeatable

--eval

Load file

path · repeatable

--load

Skip init file

boolean

--noinit

Hide startup banner

boolean

--noinform

Batch mode

boolean

--batch

SourcesEvery flag above is checked against these

doc

--noinit If you have defined an --noinform Suppresses the --batch See batch below. --eval See eval below. --load See load below. The --noinform option stops the normal startup messsages from appearing. lisp --eval "(+ 1 2)" lisp --load ~/test.lisp

manual2026-10

armedbear.common-lisp.dev

Before it fills your prompt, Otty checks the installed abcl against its version. A form that does not match your version is not offered.