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

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

     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

     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

     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

	     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.

	     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

     --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.

	     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.

	     Generate a	concise	listing.

	     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.

	     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-

	     Generate a	listing	of preludes.

	     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.

	     Suppress all warning messages.

	     Use quote stropping.

	     Print reductions made by the parser.

	     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.

	     Generate statistics in the	listing	file.

	     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.

	     Generate an overview of unused tags in the	listing	file.

	     Use upper stropping, which	is the default stropping regime.

	     Use verbose mode.

	     Print the version of the running image of a68g.

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

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

     Author of Algol 68	Genie is Marcel	van der	Veer <>.

LINUX			       November	3, 2016				 LINUX


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