echo -e "usage : $0 <FILE> [USER]\n Generate the exercice for a class.\nFILE must be a list containing identifiers (names) and passwords for each student, separated by a '='.\n Ex:\n Jean-claude-dus=mot_de_passe\n Jean-dus-claude=passe_de_mot\n Claude-jean-dus=azerty\nIf a USER is provided, init will only be run for that user (useful to add a student mid-class, reset a session when something went horribly wrong, or if a student finished early and wants to start over.\n\nThis file must be executed from the same folder as the files gen_arbo.sh, gen_seed.sh and gen_enonces.sh.\nFolders will be created in this directory, containing the exercices, their correction and the grades of the students."