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shellfish

Equivalent to sudo tee filename <<<"string" in fish

Right now I execute the following command in bash:

sudo tee /proc/acpi/nvhda <<<ON

However, I would like to use that command in fish instead of bash. The <<< does not work in fish an throws an error. What would be the equivalent in fish?

I tried to pipe an echo, but that throws me a permission denied. 

sudo echo "ON" | /proc/acpi/nvhda
Solution

  • As an approach that works in fish just as effectively as it works in POSIX-family shells:

    echo ON | sudo tee /proc/acpi/nvhda

    There's no point to sudo echo -- echo just writes to the already-open stdout handle it inherited from its parent process; it doesn't open any files, so it doesn't need any permissions.

    The point to tee is having a process external from the shell that can thus be on the other end of sudo. That works whether or not you have heredoc or herestring support in use.