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The command "G (end), g (start)" refers to two different commands in the Vim text editor.

1. "G" command: It is a capital letter that represents the "Go to" command in Vim. When you press the "G" key in Vim, it allows you to navigate to a specific line in the file. By default, if you simply press "G" without specifying a line number, it will take you to the last line of the file. However, you can also combine "G" with a number to go to the specified line. For example, pressing "5G" will take you to the 5th line of the file.

2. "g" command: It is a lowercase letter that serves as a prefix for various navigation commands in Vim. When you press "g" followed by another key, it activates a specific functionality. One of the common usages of "g" is to go to the start of a file. Pressing "gg" (double "g") takes the cursor to the first line of the file.

To summarize, "G" (capital) is used to jump to a specific line (defaulting to the last line), while "g" (lowercase) is used as a prefix for various navigation commands, such as going to the start of the file with "gg".