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Full Discussion: Expect Script - Variables are Empty immediately after "Setting" Them?
Top Forums Shell Programming and Scripting Expect Script - Variables are Empty immediately after "Setting" Them? Post 302780011 by mrm5102 on Wednesday 13th of March 2013 04:51:24 PM
Old 03-13-2013
Expect Script - Variables are Empty immediately after "Setting" Them?
Hello All,

I have embedded some expect code inside a Bash script I'm writing, but for some reason any variable I 'set' to something is
showing as empty immediately on the next line...

I haven't run into this problem before so I'm not sure what it could be...? I'm guessing it has something to do with the code
being embedded in another script..?


Here's my Code:
Code:
#!/bin/bash

echo "Here, in Bash Script"

# other stuff.....:......


/usr/bin/expect - << EOF

    set my_var "Hello World"

    puts "my_var = $my_var\n"

EOF

echo "Back from Expect Script"

exit 0

And my Output:
Code:
Here, in Bash Script
my_var = 

Back from Expect Script

Anyone know why the variables are NOT being set? I'm Stumpped..!!!
Any thoughts would be very much appreciated.


Thanks in Advance,
Matt

---------- Post updated at 04:51 PM ---------- Previous update was at 04:17 PM ----------

Figured it out...!!

You need to escape the '$' in front of any/all variables. I think this is due to using the "<<" which is open to variable expansion, so
I think that's why they need to be escaped...

So if the code is like this, it will work:
Code:
#!/bin/bash

echo "Here, in Bash Script"

# other stuff.....:......


/usr/bin/expect - << EOF

    set my_var "Hello World"

    puts "my_var = \$my_var\n"

EOF

echo "Back from Expect Script"

exit 0

*Notice the '\' in front of "\$my_var" in the puts statement...

And my Output:
Code:
Here, in Bash Script
my_var = Hello World

Back from Expect Script

Hopefully that helps someone in the same predicament I was in...

Thanks,
Matt
 

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LEARN ABOUT OSX

locale::codes::script

Locale::Codes::Script(3pm)				 Perl Programmers Reference Guide				Locale::Codes::Script(3pm)

NAME

       Locale::Codes::Script - standard codes for script identification

SYNOPSIS

	  use Locale::Codes::Script;

	  $script  = code2script('phnx');		      # 'Phoenician'
	  $code    = script2code('Phoenician'); 	      # 'Phnx'
	  $code    = script2code('Phoenician',
				 LOCALE_CODE_NUMERIC);	      # 115

	  @codes   = all_script_codes();
	  @scripts = all_script_names();

DESCRIPTION

       The "Locale::Codes::Script" module provides access to standards codes used for identifying scripts, such as those defined in ISO 15924.

       Most of the routines take an optional additional argument which specifies the code set to use. If not specified, the default ISO 15924
       four-letter codes will be used.

SUPPORTED CODE SETS

       There are several different code sets you can use for identifying scripts. A code set may be specified using either a name, or a constant
       that is automatically exported by this module.

       For example, the two are equivalent:

	  $script = code2script('phnx','alpha');
	  $script = code2script('phnx',LOCALE_SCRIPT_ALPHA);

       The codesets currently supported are:

       alpha, LOCALE_SCRIPT_ALPHA
	   This is a set of four-letter (capitalized) codes from ISO 15924 such as 'Phnx' for Phoenician.  It also includes additions to this set
	   included in the IANA language registry.

	   The Zxxx, Zyyy, and Zzzz codes are not used.

	   This is the default code set.

       num, LOCALE_SCRIPT_NUMERIC
	   This is a set of three-digit numeric codes from ISO 15924 such as 115 for Phoenician.

ROUTINES

       code2script ( CODE [,CODESET] )
       script2code ( NAME [,CODESET] )
       script_code2code ( CODE ,CODESET ,CODESET2 )
       all_script_codes ( [CODESET] )
       all_script_names ( [CODESET] )
       Locale::Codes::Script::rename_script  ( CODE ,NEW_NAME [,CODESET] )
       Locale::Codes::Script::add_script  ( CODE ,NAME [,CODESET] )
       Locale::Codes::Script::delete_script  ( CODE [,CODESET] )
       Locale::Codes::Script::add_script_alias	( NAME ,NEW_NAME )
       Locale::Codes::Script::delete_script_alias  ( NAME )
       Locale::Codes::Script::rename_script_code  ( CODE ,NEW_CODE [,CODESET] )
       Locale::Codes::Script::add_script_code_alias  ( CODE ,NEW_CODE [,CODESET] )
       Locale::Codes::Script::delete_script_code_alias	( CODE [,CODESET] )
	   These routines are all documented in the Locale::Codes::API man page.

SEE ALSO

       Locale::Codes
	   The Locale-Codes distribution.

       Locale::Codes::API
	   The list of functions supported by this module.

       http://www.unicode.org/iso15924/
	   Home page for ISO 15924.

       http://www.iana.org/assignments/language-subtag-registry
	   The IANA language subtag registry.

AUTHOR

       See Locale::Codes for full author history.

       Currently maintained by Sullivan Beck (sbeck@cpan.org).

COPYRIGHT

	  Copyright (c) 1997-2001 Canon Research Centre Europe (CRE).
	  Copyright (c) 2001-2010 Neil Bowers
	  Copyright (c) 2010-2012 Sullivan Beck

       This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

perl v5.16.2							    2012-10-11						Locale::Codes::Script(3pm)
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