gnuplot stdin, how to plot two lines?

Question

I\'m trying to produce a plot with two lines using data taken from stdin. I have a file \"test.csv\":

0,1.1,2
1,2,3
2,6,4
4,4.6,5
5,5,6

I\

Answer 1

Maybe this is an old question but I've found an interesting solution based on the other answers:

cat filename | awk -- '{print $0} END{print "e"}' | tee -i -a - -

The output would be:

"contents of filename"
e
"contents of filename"
e
"contents of filename"
e

Now cat and awk work as usual, the utility tee on the other hand allows us to copy the standard output piped from the previous command to a file, but this file can be stdin itself so we can make many copies of it, by specifying n times - after -a.

The option -i stops it being interrupted by signals during the copy, -a tells it to append the input to standard input without overwriting and then write the whole thing to stdout.

For reference take a look at Tee Utility