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Plotting memory usage on console

This is just a simple hack to play around with gnuplot set to dumb terminal (character console), doesn't meant to be serious application.
First I had written a bash scritp to log memory usage a while ago:


So, while running this script in background (./memUsage.sh > memUsage.dat &), logging the data, the memory usage information can be plotted with gnuplot and watched in real time:
watch -n 1 'gnuplot -e "set terminal dumb;p \"memUsage.dat\" with impulses"'

The chart can be plotted with lines, with impulses or any gnuplot style option.


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In my post " Plotting memory usage on console " the chart doesn't pan the data. Now, using a named pipe, the effect got a little bit nicer. First, we have to run the memUsage.sh script to get a file filled with memory usage info: ./memUsage.sh > memUsage.dat & Then we have to create a named pipe: mkfifo pipe Now we have to run another process to tail only the last 64 lines from the memUsage.dat while [ 1 ]; do tail -64 memUsage.dat> pipe; done & And now we just have to plot the data from the pipe: watch -n 1 'gnuplot -e "set terminal dumb;p \"pipe\" with lines"' And that is it!