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.
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Please use code tags next time for your code and data.
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LEARN ABOUT OPENSOLARIS
gvfs-monitor-file
gvfs-monitor-file(1) User Commands gvfs-monitor-file(1)NAME
gvfs-monitor-file - monitor the change of a file using the VFS system
SYNOPSIS
gvfs-monitor-file URI
DESCRIPTION
gvfs-monitor-file monitors the change of a file using the VFS system.
OPERANDS
The following operands are supported:
URI Specifies the file location in standard URI format.
EXAMPLES
Example 1: Monitor a local file
example% gvfs-monitor-file file:///tmp/example
ENVIRONMENT VARIABLES
See environ(5) for descriptions of the following environment variables: NLSPATH.
EXIT STATUS
The exit value 0 is returned regardless of success or failure.
FILES
The following files are used by this application:
/usr/bin/gvfs-monitor-file Executable to monitor the change of a file using the VFS system.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWgnome-gvfs |
+-----------------------------+-----------------------------+
|Interface stability |Volatile |
+-----------------------------+-----------------------------+
SEE ALSO gvfs-copy(1), gvfs-info(1), gvfs-less(1), gvfs-ls(1), gvfs-mkdir(1)gvfs-monitor-dir(1), gvfs-cat(1), gvfs-mount(1), gvfs-move(1), gvfs-
rename(1), gvfs-open(1), gvfs-rm(1), gvfs-save(1), gvfs-trash(1), gvfs-tree(1), attributes(5), environ(5)NOTES
Written by Alvaro Lopez Ortega, Sun Microsystems Inc., 2008.
SunOS 5.11 25 Mar 2008 gvfs-monitor-file(1)