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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.help
Subject: Re: Convert the shell command used in emacs init-file into its normal
 version.
Date: Wed, 09 Jun 2021 20:17:25 +0300
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 (message from Hongyi Zhao on Wed, 9 Jun 2021 22:21:58 +0800)
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> From: Hongyi Zhao <hongyi.zhao@gmail.com>
> Date: Wed, 9 Jun 2021 22:21:58 +0800
> Cc: help-gnu-emacs <help-gnu-emacs@gnu.org>
> 
> > > "curl -s https://api.mathpix.com/v3/latex -X POST -H \"app_id: %s\" -H
> > > \"app_key: %s\" -H \"Content-Type: application/json\" --data
> > > \"{\\\"src\\\":\\\"%s\\\",\\\"formats\\\":
> > > [\\\"latex_styled\\\"],\\\"format_options\\\":{\\\"latex_styled\\\":
> > > {\\\"transforms\\\": [\\\"rm_spaces\\\"]}}}\""
> > >
> > > I want to obtain its normal version and test it under the system's
> > > shell terminal. Any hints for deleting the escape characters correctly
> > > from the above command in Emacs way?
> >
> > Did you try using split-string-and-unquote?
> 
> To be frank, no. It's an eshell command, and I'm unfamiliar with it.
> Any hints for using it in this case?

Sorry, I don't understand: you want hints for using what?

And how does eshell come into play here, I don't think you mentioned
that before.