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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 CENTOS

tcl_callwhendeleted

Tcl_CallWhenDeleted(3)					      Tcl Library Procedures					    Tcl_CallWhenDeleted(3)

__________________________________________________________________________________________________________________________________________________

NAME

       Tcl_CallWhenDeleted, Tcl_DontCallWhenDeleted - Arrange for callback when interpreter is deleted

SYNOPSIS

       #include <tcl.h>

       Tcl_CallWhenDeleted(interp, proc, clientData)

       Tcl_DontCallWhenDeleted(interp, proc, clientData)

ARGUMENTS

       Tcl_Interp *interp (in)			     Interpreter with which to associated callback.

       Tcl_InterpDeleteProc *proc (in)		     Procedure to call when interp is deleted.

       ClientData clientData (in)		     Arbitrary one-word value to pass to proc.
_________________________________________________________________

DESCRIPTION

       Tcl_CallWhenDeleted arranges for proc to be called by Tcl_DeleteInterp if/when interp is deleted at some future time.  Proc will be invoked
       just before the interpreter is deleted, but the interpreter will still be valid at the time of the call.  Proc should  have  arguments  and
       result that match the type Tcl_InterpDeleteProc:
	      typedef void Tcl_InterpDeleteProc(
		      ClientData clientData,
		      Tcl_Interp *interp);
       The clientData and interp parameters are copies of the clientData and interp arguments given to Tcl_CallWhenDeleted.  Typically, clientData
       points to an application-specific data structure that proc uses to perform cleanup when an interpreter is about to go away.  Proc does  not
       return a value.

       Tcl_DontCallWhenDeleted	cancels  a previous call to Tcl_CallWhenDeleted with the same arguments, so that proc will not be called after all
       when interp is deleted.	If there is no deletion callback that matches interp, proc, and clientData  then  the  call  to  Tcl_DontCallWhen-
       Deleted has no effect.

KEYWORDS

       callback, delete, interpreter

Tcl									7.0						    Tcl_CallWhenDeleted(3)
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