# Command-Line Interface After you [installed](../intro/installation) energon, a script called `energon` will be added to your PATH. It provides commands to prepare, preview, or lint datasets on disk. Here's a simple example: ```shell energon prepare /mnt/data/my_captioning_webdataset ``` The above command will scan your existing off-the-shelf [web dataset](https://webdataset.github.io/webdataset/) and add the [needed metadata](data-on-disk) to make it compatible with Energon. Below, you can see the available sub-commands under `energon`. ```{eval-rst} .. click:: megatron.energon.cli.main:main :prog: energon :nested: short ``` (energon_data_prepare)= ## energon prepare An interactive tool to generate metadata for your existing webdataset. This will help make the dataset compliant with our [format](data-on-disk). The tool will ask you for a train/val/test split and how to assign the webdataset fields to the fields of the corresponding sample type in Energon. See [Data Preparation](../basic/data_prep) for more details on how to use this command. ## energon info Prints information about the dataset such as overall number of samples and size. ## energon lint You can execute this tool on the prepared dataset to check if the data is valid and loadable. It will report any problems such as non-readable images. ## energon preview This command will load a dataset and display samples one-by-one on the console. Note that this will not work for datasets with non-standard flavors or crude datasets.