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  A command line is a text-based interface , which can be used to input instructions to a computer system. The Linux command line is provided by a program called the shell . Over the long history of UNIX-like systems, many shells have been developed. The default shell for users in Red Hat Enterprise Linux is the GN U Bourne-Again Shell (bash). Bash is an improved version of one of the most successful shells used on UNIX-like systems, the Bourne Shell (sh). Another way to access a shell is from a virtual console. A Linux machine's physical console supports multiple virtual consoles which act like separate terminals. Each virtual console supports an independent login session. If the graphical environment is available, it will run on the first virtual console in Red Hat Enterprise Linux 7. Five additional text login prompts are available on consoles two through six (or one through five if the graphical environment is turned off). With a graphical environment running, access a tex

  History of Linux https://distrowatch.com/table.php?distribution=redhat Year Description 1964 Ø   They wanted to develop such kind of OS where multiple users will access simultaneously at Bell Laboratory in New Jersey. Ø   There were 5 members in this team Ø   This was a UNIX Project 1969 After 4 years later they withdrawn this project   Ø   2 Members named - Dennis Ritchie & Ken Thompson   started on that project again with new named project – UNICS (Uniplexed Information & Computing Services) Ø   It was a FREE 1975 Ø   An advanced version named – UNIX V6   was very popular which was FREE Ø   But some company wanted to launch it commercially purpose. Like # IBM – AIX            SUN   Solaris            MAC   OS            HP - UX            ** All of above version are flavor of   UNIX. Even $5000 was need to buy these