Examples described herein relate to a system consistent with the disclosure. For instance, the system may comprise a memory resource, a processing resource, and a database to collect command code information for a command line interface of a client device included in a plurality of client devices, analyze the command code information, modify a command code based on the command code information, and send the modified command code to of the plurality of client devices to cause a modified output responsive to execution of the command code on the plurality of client device.