Task 2 of #90daysofdevops challenge
What is Linux?
Linux is an operating system, which is based on Linux Kernel. It is an open-source operating system where it can run on different hardware platforms. It provides a free and low-cost operating system for users. It is a user-friendly environment where they can easily modify and create variations in the source code.
Basic Commands
/ is your root directory
~ is your home directory
uname : it show name of kernel (OS)
uname -r : it show version of kernel
clear : it use for clear screen
whoami : it show currently login user name
history : it show list of previously used commands
date : it show time and date
cal : show this month's calendar
users : Display the username of all users currently logged on the system
lastlog : The lastlog command is used to find the details of a recent login of all users
Tail : This command prints the last N number of data of the given input. By default, it prints 10 lines.
Chmod : This command is used to change the access permissions of files and directories.
Chown : This command is used to change the file Owner or group.
Listing commands
ls option_flag arguments --> list the sub-directories and files available in the present directory.
ls -l :- list the files and directories in a long list format with extra information
ls -a :- list all including hidden files and directory
ls *.sh :- list all the files having .sh extension.
ls -i :- list the files and directories with index numbers inodes.
ls -d */ :- list only directories.(we can also specify a pattern)
Directory commands
pwd --> print work directory. Gives the present working directory.
cd path_to_directory --> change the directory to the provided path
cd ~ or just cd --> change the directory to the home directory
cd - --> Go to the last working directory.
cd .. --> change the directory to one step back.
cd ../.. --> Change directory to 2 levels back.
mkdir directoryName --> to make a directory in a specific location
Examples:
mkdir newFolder : make a new folder 'newFolder'
mkdir .NewFolder : make a hidden directory (also . before a file to make it hidden)
mkdir A B C D : make multiple directories at the same time
mkdir /home/user/Mydirectory : make a new folder in a specific location
mkdir -p A/B/C/D : make a nested directory
Thanks For Reading! :)