TOPIC 1 ACCESSING THE COMMAND LINE IN RHEL 7

A command line is a text-based interface which can be used to input to a system. Linux command line is provided by a program called the shell.

When you open shell prompt the default prompt ends with a $ character.

[redhat@desktop -]$

redhat - user name, $ is represent that user is not a root. The $ is replaced by #  if the shell is running as the superuser root. that some thing helps to avoid accidents and mistakes in privileged account.

[ root@desktop -]#

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NOTE

Bash is similar in concept to the command line versions of Microsoft Windows cmd.exe

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Virtual consoles 

When we click 

ctrl + alt + f1 

then open GUI with terminal (windows terminal) and,

ctrl + alt + f2

then open virtual terminal. and we are open 6 terminal by using functions key 

Shell basics 

Command entered at the shell prompt have three basic parts:

• Command to run
• Options to adjust the behavior of the command
• Arguments which are typing targets of the command

eg.;-

usermod -L rahul

usermod - command

-L - options

rahul - argument

COMMANDS

# ctrl + alt + l (logout)

#  shutdown   

# halt             (this 3 commands is use for shutdown system) 

# init 0    

# poweroff -f

# shutdown -h <time in minutes>

# date 

# date +%R

# date +%x

# passwd (If change password)

# history