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Full Discussion: Use “tail -f” to monitor and report, but the top line should be always fixed on the screen.
Top Forums Shell Programming and Scripting Use “tail -f” to monitor and report, but the top line should be always fixed on the screen. Post 302763803 by df3c on Wednesday 30th of January 2013 12:41:17 PM
Old 01-30-2013
Oracle Use “tail -f” to monitor and report, but the top line should be always fixed on the screen.
Title: Use “tail -f” to monitor and report, but the top line should be always fixed on the screen.
Hi, dear Unix experts,

I am trying to find a Unix command (or scripting) on how to continuously display a text file of its last several lines of contents. But during this displaying, I want some of the top lines are always displayed on the screen top when the scrolling contents reach the screen top.

To make a simple, a text file “test001.log” is in its running process with the ending lines adding.
Code:
tab1	tab2	tab3	tab4	tab5
0.9	5.0	17.7	9.7	19.9
0.6	9.1	4.3	0.6	41.9
0.0	2.8	14.9	5.0	5.6
0.2	5.8	62.4	17.3	41.5
0.6	8.0	74.9	0.7	19.4
0.7	4.3	48.1	2.8	30.3
0.0	5.3	0.3	16.4	42.8
0.2	7.8	70.8	11.6	10.8
0.6	7.5	89.4	19.7	34.9
0.4	2.5	88.5	0.1	22.7
0.4	1.1	41.3	8.4	18.6

Say, I want to use some commands like “tail –f”, but it will show a total number of 10 lines. The top line (possibly several lines in the middle) always shows “tab1 tab2 tab3 tab4 tab5”. The rest 9 lines show the last latest updated 9 lines. Such scrolling should not exceed outside my Unix screen shell.

I’ve tried to search such function in many websites, but haven’t found useful information. I would think this function is very useful. But can I do it?Smilie

Thanks in advance.

Moderator's Comments:
Mod Comment Please use code tags next time for your code and data.
 

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LEARN ABOUT DEBIAN

osd_cat

XOSD(1) 						      General Commands Manual							   XOSD(1)

NAME

       osd_cat - X on-screen file displayer

SYNOPSIS

       osd_cat [OPTION] [FILE]...
       osd_cat -b percentage|slider [OPTION]

DESCRIPTION

       Display FILE, or standard input, on X screen.

       -p, --pos=POS
	      This option tells osd_cat where to display the text. POS can be top, middle, or bottom. The default is top.

       -o, --offset=OFFSET
	      This option specifies the offset from the top or bottom of screen the text is displayed. The default is 0.

       -A, --align=ALIGN
	      This option tells osd_cat where to display the text. ALIGN can be left, right or center. The default is left.

       -i, --indent=OFFSET
	      This option specifies the INDENT from the left of screen the text is displayed. The default is 0.

       -f, --font=FONT
	      This option specifies the FONT to be used for displaying the text. The default is fixed.

       -c, --color=COLOR
	      This option specifies the COLOR to be used for displaying the text. The default is red.

       -d, --delay=TIME
	      This option specifies the number of seconds the text is displayed. The default is 5 seconds.

       -l, --lines=LINES
	      This option specifies the number of LINES to scroll the display over. The default is 5.

       -s, --shadow=OFFSET
	      This option specifies the OFFSET of the text shadow. The default is 0, which means no text shadow is created.

       -S, --shadowcolour=COLOUR
	      This option specifies the COLOUR of the text shadow.  The default is black.

       -O, --outline=WIDTH
	      This option specifies the WIDTH of the text outline.  The default is 0, which is no outline.

       -u, --outlinecolour=COLOUR
	      This option specifies the COLOUR of the text outline.  The default is black.

       -a, --age[=SCROLL_AGE]
	      This  option  affects  screen  redrawing.  If SCROLL_AGE seconds pass before a new line is ready (for example, you're reading from a
	      pipe), all lines are cleared at once instead of being scrolled off as new lines replace old lines. The default is 0.
	      When no SCROLL_AGE is explicitly given, the current value from DELAY is used.

       -w, --wait
	      This option also affects screen redrawing. When there is data ready to be put on screen, this option  will  cause  osd_cat  to  wait
	      until the display is clear. An alternative to scrolling.

       -b, --barmode=TYPE
	      Lets  you  display a percentage or slider bar instead of just text.  TYPE may be percentage or slider.  In this mode no text is read
	      from any file, but the following options can be used:

       -P, --percentage=PERCENTAGE
	      This option specified the position of the percentage / slider bar.  PERCENTAGE may be in the range from 0 to 100, the default is 50.

       -T, --text=TEXT
	      This option specifies an optional TEXT which gets displayed above the percentage bar.  The default is empty, so no  additional  text
	      is displayed.

       -h, --help
	      display help (which is often more up to date) and exit

       With no FILE, or when FILE is -, read standard input.

AUTHOR

       Martijn	van  de  Streek  <martijn@foodfight.org>,  Some  patching  done  by  Malcolm  Valentine  <farkit@iprimus.com.au>  and  Tim  Wright
       <tim@ignavus.net>.
       xosd was written by Andre Renaud <andre@ignavus.net> and is maintained by Tim Wright <tim@ignavus.net>

SEE ALSO

       More   information   on	 the   X   OSD	 Library   and	 its	author	  can	 be    found	on    http://www.ignavus.net/software.html
       <http://www.ignavus.net/software.html>

COPYRIGHT

       It is distributed under the GNU General Public License.

X OSD cat							   January 2001 							   XOSD(1)
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