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A user may switch their identities when logged in using the 'su' command. On some systems the 'su' command may be restricted.
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Why do you require different shells in unix?
Different shells are not required in Unix; they happen to be available to users to switch to if they wish. Different shells have different environments, depending on what type of user you are. Some users prefer one shell environment over another but it is merely personal choice, not a requirement.
Who is Unix work performed by?
Unix work is performed by users of the unix system, for application and system programs, or anything that requires a Unix system.
Are there still people using unix?
Yes, quite a bit of companies and users use unix.
What is a UNIX command that will count how many users have logged on and also the users list in the UNIX system?
There are many ways to do this, but the fastest and easiest is to use the 'uptime' command, which will tell you in a summary line how many users are logged in.
What is the purpose of -a in unix?
This includes the presence of a switch or option - in this case the 'a' option. Every command in Unix is free to interpret what they means differently as there is no universal meaning for this switch.
What is the three categories of users in a Unix environment?
Unix has the following categories of users: Superuser - root account, can do anything on the system ordinary user - has no special privileges restricted user - is restricted in what they can do in the shell and programs they can run.
What is the prompt symbol traditionally associated with ordinary users in UNIX?
dollar sign ($)
How many separate users does a UNIX or Linux server allow before additional licenses must be purchased?
In general Linux has no restrictions on the number of users in a server. Commercial Unix vendors vary in what they allow by licensing, so it depends on the vendor.
How can you learn all of the Unix commands?
It would take a very long time to learn all of the Unix commands, and frankly, that isn't necessary. Most Unix users have a subset of commands they use all the time, and that is how they learn them.
Unix command to count how many users have logged on to the unix system?
The 'uptime' command will tell you exactly how many users are on the system. There are other variations of this, including counting the number of words from the 'users' command, etc., but this is the easiest.
Who are the users of Unix System III?
Nobody. There's been no serious usage of System III in decades.
What is the expansion of the abbreviation UNIX?
Unix is not an abbreviation. The name is a play on the Multics operating system. Multics (Multiplexed Information and Computing Service) supported multiple users; Unix originally supported only one, making it essentially a single user version of Multics.
