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.
CSI (or ESC [) is followed by a sequence of parameters, . . .
r DECSTBM Set scrolling region; parameters are top and bottom row.
e.g. echo -en "\033[2;45r" followed by an ^L (ctrl L, clear screen)will clear the screen, put your first line (=header) into row 1, and then scroll happily the text coming below that, i.e. between lines 2 and 45.
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