October 1, 1979 CONTROL CHARACTERS
3 CONTROL CHARACTERS ____________________
Since standard keyboards on terminals have only a limited
number of control characters, FRESS reserves some characters to
indicate special command language functions and format codes.
must These characters ____ be used as specified below.
3.1 SUMMARY TABLE _________________
Figure 3.1 summarizes the definitions and conventions for
representing control characters literally in files, specifying
them in command lines, or in lines while in Input Mode.
Some characters always have special meanings (e.g., "%"), while
others have special meanings in Command Mode (e.g., "=") and
still others have special meanings only sometimes in Command
Mode (e.g., "&").
Any character which has a listing under "Literal Input" must be
entered into the file ______________________ using either the representation shown or
the special character code listed under "Sp Char Code" (other
optionally characters may __________ use their special character codes).
If the Literal Command explanation uses "<n>" (e.g., "<n>+1"),
it refers to <n> occurrences of the symbol.
If there is no entry under "Literal Command" or "Literal Input,"
the control character can be specified as any other character
would be.
18 -- Section 3 Release 9.1 FRESS Resource Manual
October 1, 1979 CONTROL CHARACTERS
SUMMARY TABLE


Control Sp Char Literal Literal
Char Name Code Input Command ____ _________________ _______ ______ ______________________

BSP backspace !22
_ blank fill !109
% capitalize char !63 !/
> command separator !110 ">>" at all times
only ? defer char !111 "??" if it is the ____
character specified as
part of <lp> or
<scope>; "?" all other
times
= defer separator !126 "==" at all times
... ellipses !75!75!75 <n>+1 periods when <n>
is greater than 2
! format code delim !62 !!
any Key delimiter
@ logical char del !124
ESC logical escape
% logical hyphen !63 !/
¢ logical line del !74
# logical linend !123
& LP char !80 "&&&" in <scope> or
<lp> parms, "&" all
other times
only LP separator !79 <n>+1 ____ if followed
by one or two signed
integers
%% multi-cap delim !63!63 !/!/
¬ special blank !62
% Str code delim !63 !/
- qualifier sep !96


char....character
del.....delete
delim...delimiter
Str.....Structure


Figure 3.1 -- Control Character Summary Table _____________________________________________
FRESS Resource Manual Release 9.1 FRESS ResoSection 3 -- 19
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