variable line-display pager?
Chip Camden
sterling at camdensoftware.com
Sun Feb 20 00:42:06 UTC 2011
Quoth Gary Kline on Saturday, 19 February 2011:
> On Sat, Feb 19, 2011 at 03:52:40PM -0800, Chip Camden wrote:
> > Quoth Gary Kline on Saturday, 19 February 2011:
> > > Need help findind a way of using existing unix utilities to diplay
> > > chunks of N lines of a text files. Here N <= the number of lines in
> > > the file.
> > >
> > > For instance, say that my xterm/console/"Konsole" is 80x53 lines.
> > > My text file is around 200 lines long and I want to use more or less
> > > or some GUI pager to display only 15 lines at one time. Tapping the
> > > space bar would display another 15 lines and so on until EOF. Is
> > > there a way of doing with with flags of the existing /usr/bin/less
> > > or is there some other pager that I can build?
> > >
> > > thanks,
> > >
> > > gary
> > >
> > >
> > >
> > > --
> > > Gary Kline kline at thought.org http://www.thought.org Public Service Unix
> > > Journey Toward the Dawn, E-Book: http://www.thought.org
> > > The 7.98a release of Jottings: http://jottings.thought.org
> > >
> > > _______________________________________________
> > > freebsd-questions at freebsd.org mailing list
> > > http://lists.freebsd.org/mailman/listinfo/freebsd-questions
> > > To unsubscribe, send any mail to "freebsd-questions-unsubscribe at freebsd.org"
> >
> > The -z option is supposed to do this:
> >
> > less -z15 file.txt
> >
> > But it appears to work only on the second and successive pages.
>
>
>
> Oh. So _that's_ why. I tried less -m 15 [because the man pages
> sais z=N; i just tried what you did with -z15. Full page first
> time, 15 lines each spacebar thereafter.
>
> Zank you, Sir Chip.. Anybody else? I'm loathe to use anything gui,
> but here's where I'll be happy w ith something GUI THat i can
> squeeze my "15" or small-n lines' worth into. Can'y believe that
> there is nothing for all theses years.... I mean, geewhiz!
> Any idea where I Should look in ports or how to google this?
>
>
> gary
>
> >
> > --
> > Sterling (Chip) Camden | sterling at camdensoftware.com | 2048D/3A978E4F
> > http://chipsquips.com | http://camdensoftware.com | http://chipstips.com
>
>
>
> --
> Gary Kline kline at thought.org http://www.thought.org Public Service Unix
> Journey Toward the Dawn, E-Book: http://www.thought.org
> The 7.98a release of Jottings: http://jottings.thought.org
>
> _______________________________________________
> freebsd-questions at freebsd.org mailing list
> http://lists.freebsd.org/mailman/listinfo/freebsd-questions
> To unsubscribe, send any mail to "freebsd-questions-unsubscribe at freebsd.org"
Is this sort of what you're looking for?
#!/usr/bin/env ruby
require 'optparse'
pagesize = 15
optparse = OptionParser.new do |opts|
opts.banner = 'usage: npg [-n pagesize] file...'
opts.on('-n', '--numlines pagesize', 'Specify page size in number of lines') do |n|
pagesize = n
end
end
begin
optparse.parse!
rescue OptionParser::InvalidOption, OptionParser::MissingArgument => e
puts e
puts optparse
exit 1
end
loop do
pagesize.times do
if line = gets
puts line
else
exit
end
end
print "More..."
STDIN.getc
end
--
Sterling (Chip) Camden | sterling at camdensoftware.com | 2048D/3A978E4F
http://chipsquips.com | http://camdensoftware.com | http://chipstips.com
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