1

After the command :set equalprg=echo.sh, the equals command simply deletes the specified region. Here is echo.sh:

#!/bin/bash
echo "$1"

Where is the input? I can assign equalprg to something like astyle and it works fine, taking text from vim on stdin. So why is there nothing on stdin for a bash script? The same thing happens when setting formatprg to a bash script too.

3

$1 isn't stdin. It's the first argument passed to the script.

There's various different ways to read from stdin in bash. Here's one:

VALUE=$(cat)
echo "$VALUE"

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