04-08-2010
sed can't match '\n' ?!
Hi:
it seems very strange.
there is a file with multiple lines. After I squeezed out the consecutive blank lines (and some other text processing), somehow the
sed '/\n/! d' file
can not generate any output, as if it can't find any line with newline.
the file is has many lines, so how could this be possible?
Thanks.
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LEARN ABOUT ULTRIX
colcrt
colcrt(1) General Commands Manual colcrt(1)
Name
colcrt - filter nroff output for CRT previewing
Syntax
colcrt [-] [-2] [file...]
Description
The command provides virtual half-line and reverse line feed sequences for terminals without such capability, and on which overstriking is
destructive. Half-line characters and underlining (changed to dashing `-') are placed on new lines in between the normal output lines.
Options
- Suppresses all underlining. It is especially useful for previewing allboxed tables from
-2 Causes half-lines to be printed, double spacing the output. Normally, a minimal space output format is used which will suppress empty
lines. The program never suppresses two consecutive empty lines, however. The -2 option is useful for sending output to the line
printer when the output contains superscripts and subscripts which would otherwise be invisible.
Examples
A typical use of would be:
tbl exum2.n | nroff -ms | colcrt - | more
Restrictions
Can't back up more than 102 lines.
General overstriking is lost; as a special case `|' overstruck with `-' or underline becomes `+'.
Lines are trimmed to 132 characters.
See Also
col(1), more(1), nroff(1), ul(1)
colcrt(1)