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DOS Filters

chrfrq23.zip (9 kb). Version 2.3 (Feb 13, 2000). Snapshot. Description: chrfrq23.txt (904 byte).
Count character frequencies in textfile. Includes source (Borland Pascal).
column23.zip (11 kb). Version 2.3 (Feb 13, 2000). Snapshot. Description: column23.txt (1343 byte).
Text column layout and page/line-number filter. Includes source (Borland Pascal).
filter40.zip (34kb). Version 4.0 (Mar 24, 2000). Description: filter40.txt (6395 byte).
General DOS text filter with options for line numbering, tab expansion, upper/lowercase translation and much more. Includes source (Borland Pascal + Assembler).
fmore13.zip (7 kb). Version 1.3 (Feb 13, 2000). Description: fmore13.txt (869 byte).
Fast MORE filter for MS-DOS. Uses direct video output.
sorttx03.zip (32 kb). Release 03 (Feb 13, 2000) - replaces sortflt1. Description: sorttx03.txt (3985 byte).
Three MS-DOS text sort filters: sort lines, sort paragraphs, reverse line order. Incl. source (Borland Pascal).
wc24.zip (16 kb). Version 2.4 (Feb 20, 2000). Snapshot. Description: wc24.txt (2066 byte).
Word Count : Counts lines, words and characters in textfile, optionally counts long words and sentences and computes fog-index for text readability. Includes source (Borland Pascal + Assembler).

For those who are not familiar with the use of DOS filters, here is a short tutorial.

Redirection, Pipes and Filters

Redirection
Directing output ( > ) from a program to a specific file or device (different from the 'standard output' device: the screen).
Directing input ( < ) to a program from a specific file or device (different from the 'standard input' device: the keyboard).

Pipe
A data-channel ( | ) in RAM that takes output from a program and feeds the data as input to another program.

Filter
A program that accepts input data - does something to the data - and delivers output data.
Both input and output may be redirected or piped.
DOS filters: find, more, sort
Examples:
dir > list.txt
redirect output from dir to the file list.txt
- if the file does not exist, it is created
- if the file exists, it is overwritten.

dir >> list.txt
redirect and append output from dir to the file list.txt
- if the file does not exist, it is created
- if the file exists, output is appended to end of file.

sort < names.txt > list.txt
use the file names.txt as input to sort.
output from sort is sent to the file list.txt.

dir | sort
pipe output from dir to sort.
output from sort is sent to standard output: the screen.

dir | sort > c:\temp\list.txt
output from sort is sent to the file c:\temp\list.txt

dir | sort | more
output from sort is piped to more.
more (a filter) delivers output one screenfull at a time.

Redirection and pipes may be used in batch files.

Source: http://www.uv.tietgen.dk/staff/mlha/PC/Soft/DOS/com/
See also: http://gatsby.tafe.tas.edu.au/batch/

All software presented on these pages may be used and copied freely without charge, but only for non-commercial purposes.
The author is not responsible for any damage or loss of data that may be caused by using it.
Alle op deze pagina's gepresenteerde software mag zonder vergoeding worden gebruikt en gekopieerd, maar uitsluitend zonder winstoogmerk. De auteur is niet aansprakelijk voor enige schade of verlies van gegevens, veroorzaakt door het gebruik ervan.

Some of my programs use routines from the Borland Windows Custom Controls library bwcc.dll. If you don't have this library installed, you can download bwcc.zip from here. Unzip this file and copy bwcc.dll into your windows\system directory. bwcc.dll is copyrighted by Borland Software Corporation.
Sommige van mijn programma's maken gebruik van de Borlands Windows Custom Controls library bwcc.dll. Indien u deze nog niet heeft geïnstalleerd kunt u hier bwcc.zip downloaden. Pak deze zipfile uit en kopieer het bestand bwcc.dll naar uw windows\system map. Het copyright op bwcc.dll berust bij Borland Software Corporation.

Date last modified: September 27, 2003

DOS Filters

Redirection, Pipes and Filters