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GETVAR.HLP
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GETVAR.COM
Size (recs) CRC Version Author/Latest Issue Disk
3k (22) 1ADF 1.4 R. Nielsen 08/89 Z3COM4
1- Syntax 2- Input Editor 3- Notes 4- Examples of Use 5- Help File
GETVAR will print a user-defined prompt, accept a line of input, and assign
that line of input to a user-defined shell variable in SH.VAR on the ROOT:
directory.
:1
Syntax: GETVAR <varname> <prompt text>
Only the first eight characters of the variable name are significant.
The prompt text will be printed left-justified on the console, followed by
a space. The user's response will be entered at this point. Typing a Ctrl-C
in the first position on the line will abort operation. The contents of the
shell variable will then be unchanged. If a Ctrl-C is struck in any other
position, it will be inserted in the line. If a response is to have a Ctrl-C
in the first position, put it in any position but the first, then delete the
chars in front of it.
Control flags for inclusion in the prompt string:
%> - switch to lowercase
%< - switch to uppercase
^ - treat next character as a ctrl character (^A is Ctrl-A)
Any character other than < or > following "%" is displayed literally.
:2
Input Editor - 1/2
The input editor control keys are:
^S or left-arrow key if defined in TCAP <-- move left one char
^D or right-arrow key if defined in TCAP <-- move right one char
^E <-- erase to [E]nd of line
^U <-- delete char [U]nder cursor
^W <-- delete [W]ord forward
^X <-- kill entire line
DEL <-- delete char before cursor
TAB <-- move to end of line, or if at end, to beginning
^A <-- move to beginning of previous word
^F <-- move to beginning of next word
^H <-- delete char before cursor
^Q <-- [Q]uote next char -- insert char literal
^C <-- abort if at beginning of line
Input Editor - 2/2
The input editor scrolls the entered text within the remainder of the
physical line following the prompt, allowing you to move and edit freely
within the line. You may enter up to 127 chars. Prompts may be longer than
the screen width.
Cursor keys are evaluated first, and may mask later functions. These
editor commands are identical to those used in SH20, except of course, that
command history recall is not possible from within GETVAR, and ^X will not
allow you to exit from GETVAR.
:3
GETVAR Notes - 1/3
a. Shell variables created with GETVAR have two features that those created
with SHVAR do not.
o Shell variable text may be lowercase (names will be uppercase).
o Shell variable text may be a Multiple-Command Line.
The first of these features may be useful when non-standard utilities
are used to retrieve and display a shell variable. A command such as
ECHO %<varname>
will always result in a capitalized display of the variable. The second
of these features has potentially many uses, giving shell variables
almost the power of aliases (remember that references to shell variables
may be nested).
GETVAR Notes - 2/3
b. GETVAR does not check to see that the user is a Wheel, but does provide
a 'secure' input editor. That is, the user cannot abort the program by
striking a control-C at the beginning of the input line. The program
may therefore be suitable for use in secure systems, although a
malicious user who can invoke the program at will could still corrupt
the SH.VAR file.
c. GETVAR abides by the Quiet Flag, except for the display of error
messages, and will set the Program Error Code byte if it is unable to
create or write the shell variable file.
d. The only option supported is the display of a help message.
e. The meanings of existing variables in SH.VAR can be edited by
SHDEFINE.COM.
GETVAR Notes - 3/3
f. Vs. 1.2 updates
- Incorporated scrolling line editor instead of SYSLIB's INLINE. Cntl-C
aborts with no change to shell variable.
g. Vs. 1.3 updates
- Fixed bug causing SH.VAR file sometimes not to be updated. Added ECHO
routine to allow display of lower-case letters in prompt. Display of
sign-on banner no longer controlled by quiet flag (only printed when
help is requested). Linked with new Vs 4 LIBs.
h. Vs. 1.4 updates
- Moved uninitialized storage to DSEG. Increased local stack size.
:4
Examples of Use
a. GETVAR run What do you wish to run?<cr> <-- you enter at command line
What do you wish to run? DIR$|VFILER<cr> <-- prompt shows, you respond
RESOLVE %run<cr> <-- you enter variable name
--> DIR is run followed by VFILER <-- computer does this
Variables are equated to (replaced by) command line text of up to 126
characters. In this example 'run' equals to running DIR followed by
running VFILER.
b. Get Help alias:
HELP:;ROOT:dir14 $.h?p h;ROOT:quiet s;ROOT:getvar ghelp enter <<
desired help file by name -;ROOT:resolve hlp %ghelp;ROOT:quiet r;$d$u:
GETVAR in the above alias places the operator's response for 'desired
help file' into a variable named 'ghelp' which is located automatically
in the ROOT: file SH.VAR. RESOLVE sets up the main command string,
expanding the 'ghelp' variable.
:5
SHUTILS.HLP
Size (recs) CRC Version Author/Latest Issue Disk
8k (55) C26B n/a Dreas Nielsen 4/86 Z3COM4
==============================================================================
Z-System HELP file for GETVAR and RESOLVE shell utilities.