Some linux commands

1. To know in which directory you are, while working in terminal.
   chmod-R777/directory
2. To decide whether the user is accessed to do the work or not.
   pwd (enter)
3. Adminitrator root mode is denoted by #.
4. User mode is denoted by $.
5. To shut down the computer.
   halt (enter)
   poweroff (enter)
   shutdown -h now (enter)
6. To restart the computer.
   reboot (enter)
7. To restart the network service.
   /etc/init.d/networking.restart (enter)

Runlevels of Linux

• car/etc/inittab(enter)
• Runlevel 0: #init 0(enter): Halt,shutdown
• Runlevel 1: #init 1(enter): Single user mode, Emergency mode
• Runlevel 2: #init 2(enter): Multiuser mode without network support
• Runlevel 3: #init 3(enter): Multiuser mode with network support
• Runlevel 4: #init 4(enter): Research purpose
• Runlevel 5: #init 5(enter): GUI and X-support
• Runlevel 6: #init 6(enter): Restart