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 NETBSD
scroll
CURSES_SCROLL(3) BSD Library Functions Manual CURSES_SCROLL(3)NAME
curses_scroll, scrl, wscrl scroll, scrollok, setscrreg, wsetscrreg -- curses window scrolling routines
LIBRARY
Curses Library (libcurses, -lcurses)
SYNOPSIS
#include <curses.h>
int
scrl(int n);
int
wscrl(WINDOW *win, int n);
int
scroll(WINDOW *win);
int
scrollok(WINDOW *win, boolf flag);
int
setscrreg(int top, int bottom);
int
wsetscrreg(WINDOW *win, int top, int bottom);
DESCRIPTION
These functions scroll areas on stdscr or on the specified window.
The scrl() function scrolls stdscr by n lines. If n is positive then then stdscr is scrolled up. n lines are lost from the top of stdscr
and n blank lines are inserted at the bottom. If n is negative then stdscr is scrolled down. n blank lines are inserted at the top of
stdscr and n lines are lost from the bottom.
The wscrl() function is the same as the scrl() function, excepting that it scrolls the window specified by win.
The scroll() function scrolls the window win up by one line.
The scrolling behaviour of a window can be controlled by using the scrollok() function. If the flag argument is TRUE then a line wrap at the
bottom of the window will cause the window to be scrolled up one line, if flag is FALSE then lines that would force a scroll will be trun-
cated.
The setscrreg() function sets up a software scrolling region on stdscr which will define a region of the screen that will be scrolled. The
scrolling of this region is also controlled by the scrollok() function.
The wsetscrreg() function does the same as the setscrreg() function, except that the scrolling region is set on the window specified by win.
If a scrolling region has been set with the setscrreg() or wsetscrreg() functions and the current cursor position is inside the scrolling
region, then only the area inside the scrolling region is scrolled.
RETURN VALUES
Functions returning pointers will return NULL if an error is detected. The functions that return an int will return one of the following
values:
OK The function completed successfully.
ERR An error occurred in the function.
SEE ALSO curses_deleteln(3), curses_insdelln(3), curses_insertln(3)STANDARDS
The NetBSD Curses library complies with the X/Open Curses specification, part of the Single Unix Specification.
HISTORY
The Curses package appeared in 4.0BSD.
BSD August 12, 2002 BSD