60 lines
1.7 KiB
Groff
60 lines
1.7 KiB
Groff
|
|
|
|
BSFILT(1) Minix Programmer's Manual BSFILT(1)
|
|
|
|
|
|
NAME
|
|
bsfilt, colcrt - a colcrt-like backspace filter
|
|
|
|
SYNOPSIS
|
|
bsfilt [ - ] [ -U ] [ file ... ]
|
|
|
|
DESCRIPTION
|
|
Bsfilt filters backspace sequences from the input file(s) (standard input
|
|
if none) in an approximation of colcrt(1). Both the backspace and the
|
|
character it returns to are removed, unless they form an underline
|
|
sequence. Underline sequences are treated according to the settings of
|
|
the - and -U options.
|
|
|
|
OPTIONS
|
|
|
|
- specifies that no underlining of any kind is to be propagated.
|
|
Without this option or the -U option, bsfilt approximates
|
|
underlining with minus signs (`-') in following lines.
|
|
|
|
-U specifies that underlining with underscore (`_') and backspace (`b')
|
|
character sequences is permitted.
|
|
|
|
SEE ALSO
|
|
cawf(1), colcrt(1) and nroff(1).
|
|
|
|
DIAGNOSTICS
|
|
Diagnostic messages are delivered to the standard error file.
|
|
|
|
HISTORY
|
|
Vic Abell of Purdue University wrote bsfilt to have a backspace filter
|
|
for cawf(1) that is independent of licensed source code.
|
|
|
|
BUGS
|
|
The maximum length of a line that can be underlined with minus signs is
|
|
fixed.
|
|
|
|
Bsfilt does not examine the characters that are being overprinted via
|
|
backspace operations. Thus, overprinting that is intended to form a new
|
|
character from several different ones is ineffective and only the last
|
|
character of the sequence is propagated - e. g., ``o^H+'', intended to
|
|
look like a bullet, is reduced to `+'.
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Purdue University February, 1991 1
|
|
|