gnuplot and awk syntax problems

Question

I've managed to get a graph automatically plotted from live data on my system, using a gpuplot script, piping the raw data through awk. The script command.gpl is below:

#------------------------run this file--------------------
#gnuplot /usr/src/scripts/plots/core_temp_data/command.gpl
#---------------------------------------------------------


set terminal png size 2100,1000
set output '/usr/src/scripts/plots/core_temp_data/output_sat.png'

set title "Core Temp versus Time"
set size ratio 0.4
set xdata time
set timefmt "%H:%M"
set format x "%H:%M"

plot "<awk '/Mon/{print $4, substr($0,match($0,/temp=[0-9.]+/)+5,RLENGTH-5)}' /var/log/rebootlogfile.log" using 1:2 with points # works

I would like to be able to:

Add variables to make the plot line more readable

eg.

condition="/Mon/" and action="print $4,substr($0,match($0,/temp=[0-9.]+/)+5,RLENGTH-5)"
Apply if then conditions to it

eg

if the record starts with Mon then plot "plot code for Mon"

or if the record starts with Tue then plot "plot code for Tue"

However, each time I try and separate the plot line I get syntax errors.

Can I do these things, if so how?

This is a link to my previous post with how I got to this stage.

Huh? You already have the condition that Mon is in the line inside your awk. If you want Tue, just change /Mon/ to /Tue/. — Mark Setchell
– Mark Setchell, Commented Sep 25, 2014 at 12:32
Sorry if I'm not being clear, I want to be able to perform if then else, on other stuff too, within the plot line. However I'm struggling to order it like I would a traditional multi-line script as appose to it all being on the same line plot "blar blar blar" — reggie
– reggie, Commented Sep 25, 2014 at 15:33
Oh, that's easy. Put all the awk script in a separate file called script.awk - make it as complicated as you like with if statements etc - then use awk -f script.awk — Mark Setchell
– Mark Setchell, Commented Sep 25, 2014 at 15:47
This is a great intro to awk grymoire.com/Unix/Awk.html#uh-2 — Mark Setchell
– Mark Setchell, Commented Sep 25, 2014 at 15:48

Tom Fenech · Accepted Answer · 2014-09-25 17:12:02Z

2

At the moment your question is a bit too broad and I think you should decide on a specific problem you would like to solve. It sounds like you might benefit from using sprintf in gnuplot to build your command string. For example:

condition = "/Mon/"
action = "print $4,substr($0,match($0,/temp=[0-9.]+/)+5,RLENGTH-5)"    
file = "/path/to/file"
cmd = sprintf("<awk '%s {%s}' %s", condition, action, file)

plot cmd with points

answered Sep 25, 2014 at 17:12

Tom Fenech

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