Issue while retrieving the unix command return status when executed with perl CPAN module expect.pm

Davewhite has asked for the wisdom of the Perl Monks concerning the following question:

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Re: Issue while retrieving the unix command return status when executed with perl CPAN module expect.pm by davido (Cardinal) on Feb 27, 2012 at 06:55 UTC
Seems like this came up just a day ago... `$?` is being interpolated as a Perl variable and its value is what's making it to the shell. You probably just need to escape the sigil: `$expect->send( "grep xyz ; echo RET_VALUE:\$?" );` [download] ...or if there's no need for interpolation anywhere else in your string literal, use single (non-interpolating) quotes: `$expect->send( 'grep xyz ;echo RET_VALUE:$?' );` [download] Update: I just realized why it seemed so familiar: You already asked a question that got you a nearly identical answer, yesterday, in this thread: Incorrect value 0 reported in command execution return value variable $?, when trying with expect->send command. Why? ...At least you got answers that confirmed one another. Seek a third opinion and you'll really have covered your @$$ ;) Dave	[reply] [d/l] [select]

Replies are listed 'Best First'.

Seems like this came up just a day ago...

$? is being interpolated as a Perl variable and its value is what's making it to the shell. You probably just need to escape the sigil:

$expect->send( "grep xyz *; echo RET_VALUE:\$?" );
[download]

...or if there's no need for interpolation anywhere else in your string literal, use single (non-interpolating) quotes:

$expect->send( 'grep xyz *;echo RET_VALUE:$?' );
[download]

Update: I just realized why it seemed so familiar: You already asked a question that got you a nearly identical answer, yesterday, in this thread: Incorrect value 0 reported in command execution return value variable $?, when trying with expect->send command. Why? ...At least you got answers that confirmed one another. Seek a third opinion and you'll really have covered your @$$ ;)

Dave