Auto plotting all columns
gnuplot
Solution
You can count the number of columns in your file using `awk` and then do a looped plot. There might be a function to get the number of columns in your data file already implemented in gnuplot but I do not know it. You can try this:
N=`awk 'NR==1 {print NF}' Data.txt`
plot for [i=2:N] "Data.txt" u 1:i
If your first row contains a comment (starting by `#`) change `NR==` to the appropriate value. If you have a variable number of columns for different rows then you might want to complicate the `awk` command.
Problem
I have a file with several columns of data (the number of columns N might me quite large). I want to plot all the columns as a function of the first one (that is, plot 'Data.txt' using 1:2, 'Data.txt' using 1:3, ..., 'Data.txt' using 1:N). The thing is, I want this command to work when I don't know the number of columns. Is that possible?