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PObash deletes my file while looping "~$ ./program > file.dat" (gnuplot)
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copied!<p>I'm doing some script on bash to plot data with gnuplot. But it doesn't work.</p> <p>I have a program which throws data to the command line. I collect that data on a file and then I loop this process over to get the desired result. Say I have this script</p> <pre><code> N = 10 ./program.exe > data_$N.dat # Creating the data to be plotted for ((i = 0 ; i<1 ; i++)) do # Dummy loop to throw all together to gnuplot echo "set size square" echo "set xrange[-$N-1:$N+1]; set yrange[-$N-1:$N+1];" echo "plot '-' using 1:2" for((j = 0 ; j <= 9 ; j++)) do # Throwing the data to gnuplot echo "cat data_$N.dat" # Updating the file and overwriting on it echo "cat data_$N.dat | xargs ./program.exe > data_$N.dat" | bash echo "e" echo "pause 0.5" done done | gnuplot -persist # Throwing the formatted data to gnuplot </code></pre> <p>So, basically I throw formatted text to gnuplot from a file, changing the content of it, but without changing the name of the file. </p> <p>Of course, I don't wanna change the name of the file because I make the calculations corresponding to that step with that file, and then I overwrite the file with the updated data. Kind of a buffer. The computational flow would be</p> <pre><code>./program.exe > data.dat # Making the initial data begin gnuplot loop throw data to gnuplot "cat data.dat | xargs ./program.exe > data.dat" # update data overwriting file end gnuplot loop pipe all the script to gnuplot </code></pre> <p>Hope is clear and you can help me :). Thanks!</p> <p>PD. I'm a physicist.</p>

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