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A68G(1)			      Programmer's Manual		       A68G(1)

NAME
     a68g - Algol 68 Genie, an Algol 68	compiler-interpreter

SYNOPSIS
     a68g [--apropos | --help |	--info [string]]
     [--assertions | --no-assertions] [--backtrace | --no-backtrace]
     [--brackets] [--check | --no-run] [--compile | --no-compile] [--clock]
     [--debug |	--monitor] [--echo string] [--execute unit | -x	unit]
     [--exit | --] [--extensive] [-f | --file string] [--frame number]
     [--handles	number]	[--heap	number]	[--listing] [--moids]
     [-O | -O0 | -O1 | -O2 | -O3] [--object | --no-object] [--overhead number]
     [--optimise | --no-optimise] [--pedantic] [--portcheck | --no-portcheck]
     [--pragmats | --no-pragmats] [--precision number] [--prelude-listing]
     [--pretty-print] [--print unit | -p unit] [--quiet] [--quote-stropping]
     [--reductions] [--rerun] [--run] [--script	string]
     [--source | --no-source] [--stack number] [--statistics] [--strict]
     [--terminal] [--time-limit	number]	[--trace | --no-trace]
     [--tree | --no-tree] [--unused] [--upper-stropping] [--verbose]
     [--version] [--warnings | --no-warnings] [--xref |	--no-xref] filename

DESCRIPTION
     Algol 68 Genie (Algol68G) is an Algol 68 compiler-interpreter. It can be
     used for executing	Algol 68 programs or scripts. Algol 68 is a rather
     lean orthogonal general-purpose language that is a	beautiful means	for
     denoting algorithms. Algol	68 was designed	as a general-purpose program-
     ming language by IFIP Working Group 2.1 (Algorithmic Languages and	Cal-
     culi) that	has continuing responsibility for Algol	60 and Algol 68.

     Algol 68 Genie and	its documentation can be obtained from

	 http://jmvdveer.home.xs4all.nl/

OPTIONS
     Options are passed	to a68g	either from the	file .a68g.rc in the working
     directory,	the environment	variable A68G_OPTIONS, the command-line	or
     from pragmats.

     Option precedence is as follows: pragmat options supersede	command-line
     options, command-line options supersede options in	environment variable
     A68G_OPTIONS, A68G_OPTIONS	supersedes options in .a68g.rc.

     Listing options, tracing options and -pragmat, -nopragmat,	take their ef-
     fect when they are	encountered in a left-to-right pass of the program
     text, and can thus	be used, for example, to generate a cross reference
     for a particular part of the program.

     Where numeric arguments are required, suffices k, M or G are allowed for
     multiplication with 2 ** 10, 2 ** 20 or 2 ** 30 respectively.

     --apropos | --help	| --info [string]
	     Print info	on options if string is	omitted, or print info on
	     string otherwise.

     --assertions | --no-assertions
	     Control elaboration of assertions.

     --backtrace | --no-backtrace
	     Control whether a stack backtrace is done in case a runtime-error
	     occurs.

     --brackets
	     Consider [	.. ] and { .. }	as being equivalent to ( .. ). Tradi-
	     tional Algol 68 syntax allows ( ..	) to replace [ .. ] in bounds
	     and slices.

     --check | --no-run
	     Check syntax only,	the interpreter	does not start.

     --clock
	     Report execution time excluding time needed for compilation.

     --compile | --no-compile
	     Switch compilation	of units on or off. Compilation	omits many of
	     the runtime checks	offered	by the interpreter proper. The program
	     is	not executed and a shell script	is generated combining source
	     code and its shared library. This shell script can	be used	as a
	     pseudo-executable.

     --debug | --monitor
	     Start in the monitor. Invoke the monitor in case a	runtime-error
	     occurs; the program will pause in the monitor on the line that
	     contains the error.

     --echo string
	     Echo string to standout.

     --execute unit | --x unit
	     Execute the Algol 68 unit.	In this	way one-liners can be executed
	     from the command line.

     --exit | --
	     Ignore further options.

     --extensive
	     Generate an extensive listing.

     -f	| --file string
	     Accept string as filename in case it conflicts with shell syntax.

     --frame number
	     Set the frame stack size to number	bytes.

     --handles number
	     Set the handle space size to number bytes.

     --heap number
	     Set the heap size to number bytes.

     --listing
	     Generate a	concise	listing.

     --moids
	     Generate an overview of modes in the listing file.

     --object |	--no-object
	     Control the listing of C code in the listing file.

     --optimise	| --no-optimise
	     Switch compilation	of units on or off. Compilation	omits many of
	     the runtime checks	offered	by the interpreter proper.  This op-
	     tion is equivalent	to -O2.

     -O	| -O0 |	-O1 | -O2 | -O3
	     Switch compilation	of units on and	pass the option	to the back-
	     end C compiler to set the optimiser level.

     --overhead	number
	     Set overhead for stack checking.

     --pedantic
	     Equivalent	to --warnings --portcheck

     --portcheck | --no-portcheck
	     Enable or disable portability warning messages.

     --pragmats	| --no-pragmats
	     Control elaboration of pragmats.

     --precision number
	     Set the precision for LONG	LONG modes to number significant dig-
	     its.

     --prelude-listing
	     Generate a	listing	of preludes.

     --pretty-print
	     Pretty-print the source file.

     --print unit | --p	unit
	     Print the value yielded by	the Algol 68 unit. In this way one-
	     liners can	be executed from the command line.

     --quiet
	     Suppress all warning messages.

     --quote-stropping
	     Use quote stropping.

     --reductions
	     Print reductions made by the parser.

     --rerun
	     Use compiled code of a previous run.

     --run   Override the --no-run option.

     --script string
	     Takes string as source file name and skips	further	option pro-
	     cessing so	these can be handled by	the script.

     --source |	--no-source
	     Control the listing of source lines in the	listing	file.

     --stack number
	     Set the stack size	to number bytes.

     --statistics
	     Generate statistics in the	listing	file.

     --strict
	     Ignores extensions	to Algol 68 syntax.

     --time-limit number
	     Interrupt the interpreter after number seconds, generating	a time
	     limit exceeded error.

     --trace | --no-trace
	     Control tracing of	the running program.

     --tree | --no-tree
	     Control listing of	the syntax tree	in the listing file.

     --unused
	     Generate an overview of unused tags in the	listing	file.

     --upper-stropping
	     Use upper stropping, which	is the default stropping regime.

     --verbose
	     Use verbose mode.

     --version
	     Print the version of the running image of a68g.

     --warnings	| --no-warnings
	     Enable warning messages or	suppress suppressible warning mes-
	     sages.

     --xref | --no-xref
	     Control generation	of a cross-reference in	the listing file.

AUTHOR
     Author of Algol 68	Genie is Marcel	van der	Veer <algol68g@xs4all.nl>.

LINUX			       November	3, 2016				 LINUX
NAME | SYNOPSIS | DESCRIPTION | OPTIONS | AUTHOR

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