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In order to use bash completion, you can have a `~/.bash_completion` like this:
```sh
if [ -d "$HOME/.bash_completion.d" ]; then
for file in "$HOME/.bash_completion.d/"*
do
source "$file" >/dev/null 2>&1
done
fi
```
and then copy our `contrib/bash_completion/b2` to your `~/.bash_completion.d/`.
The important trick is that `b2` tool must be in PATH before bash_completions are loaded for the last time (unless you delete the first line of our completion script).
If you keep the `b2` tool in `~/bin`, you can make sure the loading order is proper by making sure `~/bin` is added to the PATH before loading bash_completion. To do that, add the following snippet to your `~/.bashrc`:
```sh
if [ -d ~/bin ]; then
PATH="$HOME/bin:$PATH"
fi
# enable programmable completion features (you don't need to enable
# this, if it's already enabled in /etc/bash.bashrc and /etc/profile
# sources /etc/bash.bashrc).
if ! shopt -oq posix; then
if [ -f /usr/share/bash-completion/bash_completion ]; then
. /usr/share/bash-completion/bash_completion
elif [ -f /etc/bash_completion ]; then
. /etc/bash_completion
fi
fi
```
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