stratego-shell — interpreters a Stratego program, from a script or interactively


stratego-shell [--script file] [--prg main@file] [--cmd 'cmd'] [--cmds 'cmds'] [-i file] [-o file] [-I d | --Include d]


The Stratego Shell is a bimodal interpreter for Stratego. It can work either in interactive or script mode. In the interactive mode, strategies can be entered at the command-line of the shell, and will always rewrite the current term. Shell-specific commands can be used to inspect the environment at any point in time.

In script mode, the interpreter is provided with a text file containing a Stratego program (with --prg) or Stratego Shell script (with --script).

In either mode, the initial current term can be supplied to the interpreter with the -i option. The final current term will be written to the optional output (the -o option), or the standard output. The shell can be applied in a pipe.


I/O Options

--script filename

Interpret the script in filename. Default is to start the interactive interpreter.

--prg main@file

Interpret the Stratego program in file, starting with the strategy main.

--cmd 'cmd'

Execute one command, cmd. This can be any single strategy expression or interpreter command. It can also be a series of expressions and commands, separated by ;;. The series must not end in a ;;.

--cmds 'cmds'

As with --cmd, execute a series of commands separated by ;;. The series must be terminated by a ;;.

-I dir, --Include dir

Add the directory dir to the list of directories to search for modules.

Common Input/Output Options

-i file

The input term given by the file name file.

In the absence of the -i option, input will be read from stdin.

-o file

The output will be written to the file given by the file name file.

In the absence of the -o option, output will be written to stdout.


The output will be written in the binary (BAF) ATerm format.

ATerms in the BAF format require a lot less space than ones in the TAF format, but the Java ATerm library does not currently support baf ATerms. ATerms in the baf format is the preferred format of exchange between Stratego tools.

Common Debugging Options


See --version.

-h, -?, --help

Display usage information.

--keep int

Keep intermediate results produced by the internal stages in the pretty-printing process. This is only useful for debugging. A high value of int indicates increased eagerness for keeping intermediate results.

Default setting is 0, indicating that no intermediates will be kept.

-S, --silent

Silent execution. Same as --verbose 0.

--verbose int

Set verbosity level to numerical value int. The higher the number, the more information about pp-aterm's inner workings are printed.

Alternatively, int can be set to either of the following verbosity levels, given in increasing order of verbosity: emergency, alert, critical, error, warning, notice, info, debug, vomit.


Displays the tool name and version.


To interpret the script in script.str against the term in input.trm, do:

$ stratego-shell -i tree.trm --script script.str

Reporting Bugs

Please report bugs to


Copyright (C) 2002-2005 Eelco Visser

This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.