Chapter 1 Basics

Before going to red hat we should learn about run levels
run levels are the commands
run levels

init0 - To shut-down
init1- Single user mode{password recovery}
init2- Multi user mode without NFS
init3- Multi User mode with NFS
init4- Multi User mode with NFS(IN GUI MODE)
init5- Multi User mode with NFS(DEFAULT RUN LEVEL)
init6- REBOOT

So first of all we will learn How to change a password

• Reboot Your System (Alt+Clt+Delete)
• In the OS selection Press E to Edit
• In the kernel version again press E
• Then Type (SPACE) 1
• Then Press B
• Type passwd (User-name)
• Type and Re-type the new password

Some Basic Commands 

• date (show current system date)
• date -s (to set date)
• cal (calender)
• cal -y (shows entire year)
• cal -m(calender shows monday as first day of week)
• cal -s (sunday as the first day of the week)
• cal -j (shows the julien calender)
• cal -3 (shows current month with before and after)

Helping Commands

• Man (command name)
• info (command name)
• Whatis (command Name)
• (Command)   --help

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