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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I look forward to hearing from you.
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Discussion started by: rchaud10
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LEARN ABOUT DEBIAN
dbus-monitor
dbus-monitor(1) General Commands Manual dbus-monitor(1)NAME
dbus-monitor - debug probe to print message bus messages
SYNOPSIS
dbus-monitor [--system | --session | --address ADDRESS] [--profile | --monitor] [watch expressions]
DESCRIPTION
The dbus-monitor command is used to monitor messages going through a D-Bus message bus. See http://www.freedesktop.org/software/dbus/ for
more information about the big picture.
There are two well-known message buses: the systemwide message bus (installed on many systems as the "messagebus" service) and the
per-user-login-session message bus (started each time a user logs in). The --system and --session options direct dbus-monitor to monitor
the system or session buses respectively. If neither is specified, dbus-monitor monitors the session bus.
dbus-monitor has two different output modes, the 'classic'-style monitoring mode and profiling mode. The profiling format is a compact for-
mat with a single line per message and microsecond-resolution timing information. The --profile and --monitor options select the profiling
and monitoring output format respectively. If neither is specified, dbus-monitor uses the monitoring output format.
In order to get dbus-monitor to see the messages you are interested in, you should specify a set of watch expressions as you would expect
to be passed to the dbus_bus_add_match function.
The message bus configuration may keep dbus-monitor from seeing all messages, especially if you run the monitor as a non-root user.
OPTIONS --system
Monitor the system message bus.
--session
Monitor the session message bus. (This is the default.)
--address ADDRESS
Monitor an arbitrary message bus given at ADDRESS.
--profile
Use the profiling output format.
--monitor
Use the monitoring output format. (This is the default.)
EXAMPLE
Here is an example of using dbus-monitor to watch for the gnome typing monitor to say things
dbus-monitor "type='signal',sender='org.gnome.TypingMonitor',interface='org.gnome.TypingMonitor'"
AUTHOR
dbus-monitor was written by Philip Blundell. The profiling output mode was added by Olli Salli.
BUGS
Please send bug reports to the D-Bus mailing list or bug tracker, see http://www.freedesktop.org/software/dbus/
dbus-monitor(1)
01-30-2013
Use “tail -f” to monitor and report, but the top line should be always fixed on the screen.
