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Introduction

You may encounter such a situation:

  • "somesite.com" to "192.168.2.3" and then visit "somesite.com"
  • 5 minutes later, map "somesite.com" to "192.168.2.4" and then visit it

To change the ip-domain mapping in your machine, you have to edit your hosts file, do some changes, and save it. Frequently doing it may be annoying.

If you are a linux user, you can now make use of dacuoxian to change the mappings with a single shell command.

"dacuoxian(搭错线)", which means "connect false line" in Chinese, is a linux shell script executed by /bin/sh. Make dacuoxian your friend so that you won't connect false lines (I mean not to do false ip-domain mappings, of course)

Try it

  • download all the files
  • chmod +x dacuoxian.sh
  • sudo ./dacuoxian.sh google-hosts-sample # Note "sudo" may not be available in linux systems other than Ubuntu.
  • Now check your /etc/hosts file and you can see what's going on
  • Then try re-mapping the domains with another group of IPs: sudo ./dacuoxian.sh google-another-group-of-hosts-sample. And check your /etc/hosts again.
  • And you can create your own hosts snippets such as /somepath/foo-hosts1, /somepath/foo-hosts2, /somepath/bar-hosts1 and /somepath/bar-hosts2, and do
  • sudo ./dacuoxian.sh /somepath/foo-hosts1 #add foo-hosts1 to /etc/hosts
  • sudo ./dacuoxian.sh /somepath/bar-hosts1 #add bar-hosts1. Doing this will not remove foo-hosts1 ...
  • To disable mappings added by dacuoxian, do this: sudo ./dacuoxian.sh disable google-hosts-sample

To make it more convient

You can add some alias so that you can type less:

alias da='cd path-to-your-mapping-files; sudo /path-to-your-dacuoxian-dir/dacuoxian.sh '
alias dad='cd path-to-your-mapping-files; sudo /path-to-your-dacuoxian-dir/dacuoxian.sh disable '

then just

da some-group     #enable 
dad some-group    #disable
```

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re-map an IP to a host with a single shell command

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