Executing vim commands without interactive mode

I need to execute vim commands on thousands of files without suffering from interactive mode slowness. I tried :

    find ... | xargs vim '+set fileencoding=utf-8 | x'

and

    for file in ... ; do 
        vim '+set fileencoding=utf-8 | x' $file
    done

but it's too slow and I have warnings

Vim : Warning 开发者_运维知识库: Output is not to a terminal

Is it impossible to avoid interactive mode in vim ?

ps: I can otherwise use iconv, but it causes errors with files > 32 ko

    iconv --from-code=ISO-8859-1 --to-code=UTF-8  $file -o $file

I would do:

find .... -print0 | xargs -0 vim -c 'argdo set fenc=utf8' -c 'wqa'

Filetype, syntax and indent plugins are probably what's slowing you down. These are specified in your ~/.vimrc with a line that looks typically like:

filetype plugin indent on

• You could try commenting that out, or

• You can start Vim without your plugins and ~/.vimrc but staying in nocompatible mode by doing:

  vim -Nu NONE