8.5 How a Command Line is Processed
8.5 How a Command Line is
Processed
When FunnelWeb reads in a command line (from the console
Tutorial
or a script file), it processes it in the following sequence:
Developer
The command line is checked for non printable
1.  
characters. If there are any, they are flagged with a severe
error.
Reference
1 Introduction
All dollar string substitution variables in the command
2.  
line are replaced by their corresponding string. The
2 Interface
command line is processed from left to right.
3 Scanner
Substitutions are performed non recursively.
4 Parser
At this point, if the line is empty, or consists entirely of
3.  
5 Analyser
blanks, it is ignored and the interpreter moves to the next
6 Tangle
line.
7 Weave
A severe error is generated if the line at this stage begins
4.  
8 Shell
with a blank.
9 Commands
If the first character of the line is "
5.  
!
", the line is a
10 Glossary
comment line and is ignored.
11 References
The run of non blanks commencing at the start of the line
6.  
is compared case insensitively to each of the legal
SEARCH
command verbs. If the command is illegal, a severe error
is generated, otherwise the command is processed.
Webmaster
    
Copyright   Ross N. Williams 1992,1999. All rights
reserved.
http://www.ross.net/funnelweb/reference/shell_processing.html [3/3/2000 10:46:13 PM]





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