su Command su Substitute user id, become superuser su [user [command] ] su changes the effective user id and the effective user id to that of the user. If user has a login password, su requests it. Then it executes the specified command. If command is absent, su invokes an interactive sub-shell. If user is absent, su assumes user name root (the superuser). ***** Files ***** /etc/passwd -- Login names and passwords ***** See Also ***** commands, login, newgrp, sh, superuser COHERENT Lexicon Page 1