via wget tools if you want to download the data file from 1st January 2012, type the command : curl --insecure https://cds-espri.ipsl.fr/iasial2/iasi_cloud/V1.2.0/2012/01/IASI_METOPA_L2_CLOUD_20120101_LMD_V1.2.0.tar -O if you want to download more than one file, type : curl --insecure https://cds-espri.ipsl.fr/iasial2/iasi_cloud/V1.2.0/2012/01/IASI_METOPA_L2_CLOUD_201201[01-02]_LMD_V1.2.0.tar -O