I only get to know this recently, you can open a file & goto a specific line in vim with:

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$ vim /path/to/file +100

The above opens /path/to/file & sets u on line 100. When are already in vim, you can acheive it with:

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:e /path/to/another/file +99

But this won’t work for buffer though, meaning NONE of the following will work :(

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:b /path/to/another/file +99
:b<id> +99
:b# +99