This thread is an extension of this thread where the interruption (CTRL-c) stop the data transfer into less.
I would like to create a similar system monitoring data conversion as is found in fdupes
.
I think this can be reached with GNU screen
.
The tools tee
and buffers
may not be needed for this so skip the two sections if you want.
Hex conversion and tee [skip if you know]
You can use whatever hex dumper you want for the task, for instance hexdump -v
, od -v -t x1
and xxd -ps
for the generation of the example data.
You can create binary test data 1GB by the following command, discussed here
dd if=/dev/urandom of=sample.bin bs=64M count=16
Let's simplify the old situation without the while loop. Assume you have a very big file. You put it as STIN into less by
hexdump -v sample.bin | less -s -M +Gg
I am discussing here how to generate you big test files.
With a big file, you get an empty screen when you do not press anything, since conversion under way.
When you press CTRL-c
, you get the data that has been already converted to the less at the bottom of the screen.
This is not all data.
Does the interruption by CTRL-c
end the transfer of data from file into less?
Possibilities to fix this
- refresh the less somehow if the conversion is still underway
- bind
tee
command here somehow
Is there any way to avoid the interruption of the data conversion but be able to look the stream.
I think tee
command could be one possibility.
Buffers [I think not needed]
stdbuf -i0 -o0 -e0 xxd -ps sample.bin | stdbuf -i0 -o0 -e0 less -s -M +G
which does not resolve the problem.
I should be able refresh the output in less, where I am using the flag R
.
Only interruption will show something in less
.
I did not manage to get unbuffer
command work similarly as stdbuf
, discussing it here.
Screen
I think the best way to have a glimpse of the data conversion is to run everything inside screen
.
Logic: give stdout into less
inside screen
.
Scroll the output in screen
.
I have completed such a task before which may be found in my thread about screen
.
I have to think this once more again.
I would like to create a similar usability as in the command fdupes
.
I think tee
and buffer
may not even be needed.
How can you create screen about monitoring window when less is viewing parallerly data conversion?