Since version 2.0 DOS has supported the SORT, FIND, and MORE filters. The most useful of the DOS filters by far is the MORE filter. The MORE filter accepts the input of a file and displays it one screen at a time. Combined with piping the MORE command can be used to display the output of screen commands one screen at a time. Piping Pipes are connections between two programs or two commands or a program and a command.
Pipes allow the output of one program to be redirected as the input for a second program.
To redirect the output of one command to another type the name of the first command, followed by a vertical bar, followed by the name of the second command. The MORE filter can also be combined with a pipe to display the results of a command one screen at a time. As mentioned earlier, DOS will search the path specified, the current directory, its internal command list, and finally the PATH statement for a match with any command entered. It allows us a means of specifying directories from which we intend to run some often used programs. Where each separate directory we would like to add to our path is separated from the next by a semicolon.