how to check the size of all files in a directory linux code example

Example 1: how to get the size of directory in linux

du -sh /var

Example 2: find the size of file in linux

ls -l filename   #Displays Size of the specified file
ls -l *          #Displays Size of All the files in the current directory
ls -al *         #Displays Size of All the files including hidden files in the current directory
ls -al dir/      #Displays Size of All the files including hidden files in the 'dir' directory