Many companies offer training in Unix administration including the stayahead website, the withsupport website and the verheof-training website. Once you have the qualifications it may be hard to find a job which does not require experience but similar experience can be found in most computer related jobs.
The usual indication of running as the administrator in Unix is show a prompt that contains the '#' character as either the prompt or part of the prompt.
root
They are both administrator accounts and have privileges to do anything on the system.
Systems Administrator :)
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.
Linux is far more common these days than traditional Unix. But as any old system administrator will tell you, learn to learn, don't learn the system. There are numerous differences between the different Linux distros, differences between Linux and Unix, and differences between each of the Unices. Learning everything about each system is a daunting task, and probably near impossible. Rather than, say, learning all of the different command line switches for "ls" on each system, just know how to access a man page.
Paging is done automatically by the Unix system, so there is nothing the administrator needs to do to activate it, other than describing the swap partition, its size, and where it is.
Most companies provide roles for UNIX System Administrators. The role includes administration work and these skills are required. The website Indeed mentions this job field.
"System Administrator" is just that a general sysadmin that more than likely is only certified to use Windows Server and is network-savvy. Whereas a Linux System Administrator is certified in Linux and networking.
The command is 'wall' (write all). In some systems it can only be executed by the administrator.
For the most part, every Unix-based and Unix-like (and by extension, Linux) distribution will have a root account (equivalent to a system administrator account in Windows). The remaining accounts will be allocated for the users and for certain applications.
By using it. Many Linux distributions are designed to cater especially to new users. Classic Unix is abit harder to learn, but Solaris has a decently friendly user interface, if you can get past the god-awful installer.