# Before Mode
The Before mode places the new source *before* the existing contents of the mountpoint in the lookup order.
## Usage
```shell
frg bind -b src mountpoint
```
## Behavior
When a lookup occurs, froggr searches `src` first, and if the file isn't found there, it searches the original `mountpoint`. This creates a layered view where new content takes precedence over existing content.
## Examples
### Custom Binary Directory
Add custom binaries that take precedence over system binaries:
```shell
frg bind -b /custom/bin /bin
```
In this case, `/custom/bin/ls` will be used instead of `/bin/ls` if both exist, while other commands will fall back to `/bin`.
### Development Libraries
Prioritize development versions of libraries:
```shell
frg bind -b /dev/libs /usr/lib
```
This allows testing new library versions while maintaining access to the system libraries as fallback.