gap(1)

Groups, Algorithms and Programming

Section 1 gap-core bookworm source

Description

GAP

NAME

GAP - Groups, Algorithms and Programming

SYNOPSIS

gap [OPTIONS] [FILES]

DESCRIPTION

GAP is a system for computational discrete algebra, with particular emphasis on Computational Group Theory. GAP provides a programming language, a library of thousands of functions implementing algebraic algorithms written in the GAP language as well as large data libraries of algebraic objects. GAP is used in research and teaching for studying groups and their representations, rings, vector spaces, algebras, combinatorial structures, and more.

Startup:

-h, --help

print this help and exit

--version

print the GAP version and exit

--print-gaproot

print the primary GAP root and exit

-b, --banner

disable/enable the banner

-c

<expr> execute the expression <expr>

--systemfile

<file> read this file after ’lib/system.g’

Input/output:

-q, --quiet

enable/disable quiet mode

	-e		disable/enable quitting on <ctrl>-D
	-f		force line editing
	-n		prevent line editing

-E, --readline

disable/enable use of readline library (if possible)

-x, --width

<num> set line width

-y, --lines

<num> set number of lines

-p

enable/disable package output mode (for use by XGAP and similar interfaces)

Memory:

(may use postfix ’k’ = *1024, ’m’ = *1024*1024,

’g’ = *1024*1024*1024):

-g, --gasinfo

show GASMAN messages (full/all/no garbage collections) (only available if GAP uses GASMAN)

-m, --minworkspace

<mem> set the initial workspace size

-o, --maxworkspace

<mem> set workspace size where GAP will warn about excessive memory usage (GAP may allocate more) (only available if GAP uses GASMAN)

-K, --limitworkspace <mem>

set maximal workspace size (GAP never allocates more)

-s

<mem> set the initially mapped virtual memory (only available if GAP uses GASMAN)

Roots:

-l, --roots

<paths> set or modify the GAP root paths Directories are separated using ’;’. Putting ’;’ on the start/end of list appends directories to the end/start of existing list of root paths

-r

disable/enable user GAP root dir GAPInfo.UserGapRoot

Loading:

	-A		disable/enable autoloading of suggested GAP packages
	-D		enable/disable debugging the loading of files
	-M		disable/enable loading of compiled modules

Error handling, REPL:

-T, --nobreakloop

disable/enable break loop and error traceback

--alwaystrace

always print error traceback (overrides behaviour of -T)

--quitonbreak

quit GAP with non-zero return value instead of entering break loop

--norepl

Disable the GAP read-evaluate-print loop (REPL)

--nointeract

Start GAP in non-interactive mode (disable REPL and break loop)

Workspaces:

(only available if GAP uses GASMAN) -L <file> restore a saved workspace -R prevent restoring of workspace (ignoring -L)

Profiling:

--prof

<file> Run ProfileLineByLine(<file>) on GAP start

--memprof

<file> Run ProfileLineByLine(<file>) on GAP start with recordMem := true

--cover

<file> Run CoverageLineByLine(<file>) on GAP start

Internal developer tools

	-N		do not use hidden implications
	-O		disable/enable loading of obsolete files

--bare

Attempt to start GAP without even needed packages

Boolean options toggle the current value each time they are called. Default actions are indicated first.

AUTHORS

The GAP Group <http://www.gap-system.org>

COPYRIGHT

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