Hello developers!

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If I run this line:
httrack --clean

Or any variation of this line, such as:
httrack --clean -O <path-to-folder-with-current-mirrors> -v
 
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Then it seems like it just provides a guided setup to mirror a website for me,
rather than clearing the cache. This is my output: 

Welcome to HTTrack Website Copier (Offline Browser) 3.49-2
Copyright (C) 1998-2017 Xavier Roche and other contributors
To see the option list, enter a blank line or try httrack --help

Enter project name :[my input]

Base path (return=/Users/carolynqian/websites/) :[my input]

Enter URLs (separated by commas or blank spaces) :[my input]
Action:
(enter)	1	Mirror Web Site(s)
	2	Mirror Web Site(s) with Wizard
	3	Just Get Files Indicated
	4	Mirror ALL links in URLs (Multiple Mirror)
	5	Test Links In URLs (Bookmark Test)
	0	Quit
: 1

Proxy (return=none) :

You can define wildcards, like: -*.gif +www.*.com/*.zip -*img_*.zip
Wildcards (return=none) :

You can define additional options, such as recurse level (-r<number>),
separated by blank spaces
To see the option list, type help
Additional options (return=none) :

---> Wizard command line: [x-y-z] 

Ready to launch the mirror? (Y/n) :[my input]
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Why does it give this instead of emptying the cache? 
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Thank you for this software, it's great!