the conflict between linux terminal hotkey and key maps in vim

Hi,

How can I solve the conflict,

Eg. in vim,  do the map          imap <C-s> <Esc>di"i

then when I ctrl+s, the linux terminal will stop work.

Can  it be solved, or only avoid use terminal hotkey in vim?

Another problem about key map.

I want use "alt" key.

keymap in .vimrc as below,

set winaltkeys=no

imap <A-h> <Left>

purpose: alt+h to move the curse left in insert mode. 

but didn't work. no matter use left alt or right alt.

Thanks.

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