I want to know what are the implications of create an account using -r option?# useradd -r ...The help says:-r, --system  Create a system account.  System users will be created with no aging information in /etc/shadow, and their   numeric identifiers are chosen in the SYS_UID_MIN-SYS_UID_MAX range, defined in  /etc/login.defs, instead of UID_MIN-UID_MAX (and their GID counterparts for the  creation of groups).  Note that useradd will not create a home directory for such an user, regardless  of the default setting in /etc/login.defs (CREATE_HOME). You have to specify the  -m options if you want a home directory for a system account to be created.But, beyond assign lower values to uid, gid and groups.Question 1What files are affected?Question 2What additional performance this type system account presents?Question 3What behavior ignores or stops submit?Question 4Can I change an account created with the -r option to an account as if it were created without that option?
Implications creating System Accounts useradd -r Linux Fedora/RHEL/CentOS
centos;rhel;group;administration;useradd