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What it Means to Be a Protocol A protocol is a rule (or collection of rules) about how information is communicated. An application-layer protocol describes how programs and services communicate on top of underlying protocols of "lower" layers. These lower layers--such as the transport layer--describe how communication in general takes place, including how ...


To know more about adduser options visit : Link Well to change a user from ordinary user to system user use usermod -s option : usermod -s /bin/false userName I would suggest you also to visit : Site bin/false : Many times you will have a system where you need a user to exist in the account database (say, /etc/passwd) but don't want to give them ...

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