Listing commands
ls option_flag arguments --> list the sub directories and files available in the present directory
Examples:
ls -l--> list the files and directories in long list format with extra information
ls -a--> list all including hidden files and directory
ls *.jpg--> list all the files having .jpg extension.
ls -s--> Prints the allocated size of each file, in blocks.
ls -d */--> list only directories.(we can also specify a pattern)
Directoy commands
mkdir directoryname--> Make a Directory.
mkdir .directoryname--> Make a Hidden Directory.
pwd--> print work directory. Gives the present working directory.
cd path_to_directory--> change directory to the provided path
cd ~or justcd--> change directory to the home directory
cd ---> Go to the last working directory.
cd ..--> change directory to one step back.
cd ../..--> Change directory to 2 levels back.
mkdir directoryName--> to make a directory in a specific location
mkdir -p x/y/z--> to make a nested directory.
