Most PDF component line commands use only one letter, such as S, for selecting a member from a member list. Others, such as many of the Edit line commands, use more than one letter and sometimes allow you to add a number so the command affects more than one line. For example, the UC line command plus the number 3, as in UC3, converts three lines to uppercase.

Another type of line command is the block line command, which affects the block of lines between and including the lines on which the commands are entered. For example, the UCC line command, when entered beside two different lines, converts all lines between and including the two commands to uppercase.