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Full Discussion: Expect script problem
Top Forums Shell Programming and Scripting Expect script problem Post 302185705 by ramen_noodle on Tuesday 15th of April 2008 03:16:56 PM
Old 04-15-2008
I don't understand why this script attempts to escape the variable notation ($)
preceding the argv list.
it is utterly broken this way.
example:
Code:
proc randlist {len {components "satrednfgbhj"}} {
set i 0
                      while {$i < $len} {
                            set a [expr int(1 + rand() * [string length $components] - 1)]
                             lappend ret "[string index $components $a]"
                             incr i
                       }
                       return $ret
}

foreach a [randlist 23] {puts -nonewline "No interp of escape = \\$a\nAnd interpreted = " ; eval puts "\\$a"}

Code:
Output of above:
No interp of escape = \f
And interpreted =  
No interp of escape = \n
And interpreted = 

No interp of escape = \j
And interpreted = j
No interp of escape = \e
And interpreted = e
No interp of escape = \t
And interpreted = 	
No interp of escape = \j
And interpreted = j
No interp of escape = \e
And interpreted = e
No interp of escape = \e
And interpreted = e
No interp of escape = \n
And interpreted = 

No interp of escape = \f
And interpreted =  
No interp of escape = \t
And interpreted = 	
No interp of escape = \e
And interpreted = e

Short answer: There is no need to escape the dollar sign notation and it breaks interpretation of characters during command expansion.
 

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LEARN ABOUT MOJAVE

tcllib_interp

interp(n)						       Interpreter utilities							 interp(n)

__________________________________________________________________________________________________________________________________________________

NAME

       interp - Interp creation and aliasing

SYNOPSIS

       package require Tcl  8.3

       package require interp  ?0.1.1?

       ::interp::createEmpty ?path?

       ::interp::snitLink path methodlist

       ::interp::snitDictLink path methoddict

_________________________________________________________________

DESCRIPTION

       This package provides a number of commands for the convenient creation of Tcl interpreters for highly restricted execution.

API

       ::interp::createEmpty ?path?
	      This commands creates an empty Tcl interpreter and returns it name. Empty means that the new interpreter has neither namespaces, nor
	      any commands. It is useful only for the creation of aliases.

	      If a path is specified then it is taken as the name of the new interpreter.

       ::interp::snitLink path methodlist
	      This command assumes that it was called from within a method of a snit object, and that the command mymethod is available.

	      It extends the interpreter specified by path with aliases for all methods found in the methodlist, with the alias  directing  execu-
	      tion  to	the  same-named  method of the snit object invoking this command.  Each element of methodlist is actually interpreted as a
	      command prefix, with the first word of each prefix the name of the method to link to.

	      The result of the command is the empty string.

       ::interp::snitDictLink path methoddict
	      This command behaves like ::interp::snitLink, except that it takes a dictionary mapping from commands to methods as its  input,  and
	      not  a  list  of methods.  Like for ::interp::snitLink the method references are actually command prefixes.  This command allows the
	      creation of more complex command-method mappings than ::interp::snitLink.

	      The result of the command is the empty string.

BUGS, IDEAS, FEEDBACK
       This document, and the package it describes, will undoubtedly contain bugs and other problems.  Please report such in the  category  interp
       of the Tcllib SF Trackers [http://sourceforge.net/tracker/?group_id=12883].  Please also report any ideas for enhancements you may have for
       either package and/or documentation.

KEYWORDS

       alias, empty interpreter, interpreter, method, snit

CATEGORY

       Programming tools

COPYRIGHT

       Copyright (c) 2006 Andreas Kupries <andreas_kupries@users.sourceforge.net>

interp								       0.1.1								 interp(n)
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