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.
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?
Thanks in advance.
Moderator's Comments:
Please use code tags next time for your code and data.
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Discussion started by: rchaud10
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LEARN ABOUT DEBIAN
ip-monitor
IP-MONITOR(8) Linux IP-MONITOR(8)NAME
ip-monitor, rtmon - state monitoring
SYNOPSIS
ip monitor [ all | LISTofOBJECTS ]
DESCRIPTION
The ip utility can monitor the state of devices, addresses and routes continuously. This option has a slightly different format. Namely,
the monitor command is the first in the command line and then the object list follows:
ip monitor [ all | LISTofOBJECTS ]
OBJECT-LIST is the list of object types that we want to monitor. It may contain link, address and route. If no file argument is given, ip
opens RTNETLINK, listens on it and dumps state changes in the format described in previous sections.
If a file name is given, it does not listen on RTNETLINK, but opens the file containing RTNETLINK messages saved in binary format and dumps
them. Such a history file can be generated with the rtmon utility. This utility has a command line syntax similar to ip monitor. Ide-
ally, rtmon should be started before the first network configuration command is issued. F.e. if you insert:
rtmon file /var/log/rtmon.log
in a startup script, you will be able to view the full history later.
Certainly, it is possible to start rtmon at any time. It prepends the history with the state snapshot dumped at the moment of starting.
SEE ALSO ip(8)AUTHOR
Original Manpage by Michail Litvak <mci@owl.openwall.com>
iproute2 20 Dec 2011 IP-MONITOR(8)
01-30-2013
Use “tail -f” to monitor and report, but the top line should be always fixed on the screen.
