number of Lines displayed in Terminal
 

I am trying to list the contents of a directory in the terminal as a single line output I can then copy and paste into a text editor.

I am using the command: ls -1

This lists the directory in a single line but it is not displaying the entire contents. Its like there is a limit to the number of files that can be displayed in the terminal. Is this true or can someone tell me what to do to achieve this.

Yes. The number of lines you can scroll back depends on the terminal you're using. For example in Gnome Terminal you can set the number of lines to scroll from Edit -> Profiles -> Default -> Edit -> Scrolling -> Scrollback. In alternative you can redirect the output to a file and then open it in a text editor, where you have no limit on the number of lines displayed.