[Linux-disciples] sudo echo

[Chung-chieh Shan]

On 2005-06-12T18:07:48-0400, Stephen R Laniel wrote:
> Because of some subshell business, I'm sure, this never
> seems to work:
> 
> sudo echo foo > /proc/something

The problem is that this command means "redirect the output of running
'echo foo' as root to /proc/something", not "redirect the output of
running 'echo foo' to /proc/something as root".  After all, sudo is just
a regular program, and your shell handles both redirecting output and
running sudo.

For "sudo ... < file", you could say "sudo cat file | ..." instead.

For "sudo ... > file" as above, you could say "... | sudo act file"
given a script "act":

    #!/bin/sh
    exec cat >"$1"

This should work even when "file" contains funny characters.

If we don't have to worry about funny characters, then

    sudo sh -c "echo foo > file"

suffices.

-- 
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Mothers are the necessity of invention. --Bill Watterson
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