| 1 | .TH CR3 UCB 2/24/79 UCB |
| 2 | .SH NAME |
| 3 | cr3 \- controlled output flow filter for crt previewing |
| 4 | .SH SYNOPSIS |
| 5 | .B cr3 |
| 6 | [ |
| 7 | name ... |
| 8 | ] |
| 9 | .SH DESCRIPTION |
| 10 | .I Cr3 |
| 11 | is a filter which allows causual examination of a continuous text |
| 12 | on a soft-copy terminal. |
| 13 | It normally pauses after each 23 lines of output. |
| 14 | If the user then hits a carriage-return, 23 more lines are displayed. |
| 15 | If the user hits control-d, |
| 16 | 11 more lines are displayed (a `scroll'). |
| 17 | .PP |
| 18 | It is also possible to type positive numbers to |
| 19 | .I cr3 |
| 20 | causing that |
| 21 | many lines to be printed, or negative numbers causing that many lines |
| 22 | to be discarded followed by a scroll. |
| 23 | .PP |
| 24 | The terminal is set to |
| 25 | .I noecho |
| 26 | mode by this program so that the output can be continuous. |
| 27 | The numbers and carriage returns you type will thus not show on your terminal. |
| 28 | .PP |
| 29 | .DT |
| 30 | A sample usage of |
| 31 | .I cr3 |
| 32 | in previewing |
| 33 | .I nroff |
| 34 | output would be |
| 35 | .PP |
| 36 | nroff \-ms +2 doc.n | cr3 |
| 37 | .SH AUTHOR |
| 38 | William Joy |
| 39 | .SH ETYMOLOGY |
| 40 | .I Cr3 |
| 41 | has its unusual name because Charles Haley |
| 42 | implemented such a feature, |
| 43 | which was enabled by |
| 44 | .DT |
| 45 | .PP |
| 46 | stty cr3 |
| 47 | .SH BUGS |
| 48 | The function of |
| 49 | .I cr3 |
| 50 | should be done optionally by the teletype driver in the system, |
| 51 | akin to the ``more'' feature of the ITS systems at MIT. |
| 52 | .s3 |
| 53 | It should be possible to scan forward throwing away or keeping |
| 54 | output ala `/pattern'. |