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From: Greg Wooledge <wooledg@eeg.ccf.org>
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Subject: Re: Parameter Expansion: Case Modification: ${var~} not documented
Date: Tue, 18 Aug 2015 10:42:30 -0400
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On Tue, Aug 18, 2015 at 09:22:07AM -0500, Dan Douglas wrote:
> The `~` is obviously inspired by the vim 
> movement to toggle caps.

~ is standard vi, not a vim extension.