Passing current line number to shell command

Hi all,

I would like to ask a question regarding getting the current line number.
I can get it as follows:

:echo line(',')

It works fine but my question is in command execution with '!' in the front.

:!echo line('.')

But "line" is not interpreted before going to shell and makes an error.

Can anyone give me some guide how I can pass the current line number to shell?

Thanks,
Honggyu

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