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Is there a way scroll text instead of page?

 
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Top Forums UNIX for Dummies Questions & Answers Is there a way scroll text instead of page?
# 1  
Old 12-14-2001
Is there a way scroll text instead of page?
Is there a way to slowly scroll the output of a file instead of page or cat ?

Instead of one page at a time, I would like to slowly scroll the displayed output of the file.
# 2  
Old 12-14-2001
Well, instead of using more, you can use less, if it's installed on your box.
You could also use more, and use the "j" and "k" keys to scroll line-by-line up and down.

Hope that helps.
# 3  
Old 12-14-2001
Question more won't work for me.
I want the screen to scroll through the text automatically without keyboard intervention for the duration of the display. I didn't know if it was possible to do that or not.
# 4  
Old 12-14-2001
Perhaps a command line filter using tail -f ?

Could this work for you?
# 5  
Old 12-14-2001
How would a filter be done with tail?
How would I do that?

Just another brainstorming idea but, would I be able to read a file only say 5 lines at a time, and then sleep for 1 second before reading the next 5 lines? That may be an option but I am unsure How I would do that. Suggestions anyone?

Thanks,
# 6  
Old 12-18-2001
Well, five at a time, then sleep for one second was a little too fast for me, but feel free to change it to what you need:
Code:
#!/bin/sh
if [ "$#" -ne "1" ]; then
echo
echo "Usage: `basename $0` /path/to/text/file"
echo
exit 1
fi
if [ ! -f "$1" ]; then
echo
echo "File does not exist!"
echo
exit 2
fi

Line_total=`wc -l $1 | awk '{print $1}'`
Line_end=5

##
## See the next post for a fix to this
## next piece. Important!
##
until [ "$Line_end" -ge "$Line_total" ];
do
head -n${Line_end} $1 | tail -n5
Line_end=`expr ${Line_end} + 5`
sleep 4
done

That's just a quickie... It could be made much better (with command-line options and everything) if you want to put some time into it... It should be portable. Please let me know if it doesn't work for some reason.
Last edited by LivinFree; 12-18-2001 at 06:13 AM..
# 7  
Old 12-18-2001
Error Oops
Oops, I'm a bonehead...

The line:
until [ "$Line_end" -ge "$Line_total" ];
should have a "-gt" in the middle, not a "-ge"... It could cause you not to get the full results of the file...

Also, head may (depending on your system) have a hard-limit set. You may not be able to use this script with files over a certain length (I think it's 500 lines on some systems)...

Still, hope it helps...
 
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