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Top Forums Shell Programming and Scripting Doing a loop to change a value in a file Post 302741259 by lost.identity on Friday 7th of December 2012 05:20:09 PM
Old 12-07-2012
Thanks for the replies. I'm sorry I didn't explain my problem clearly.

I have a gnuplot script file that does the plotting (called time.gplt), in it I have the following line that plots the data.

Code:
plot 't00001.dat' using 1:2

Using rdcwayx's method I've been able to do most of what I want, i.e:

Code:
for i in {1..40};
do
        str=$(printf %05d $i)
        perl -i -pe "/plot/&&s/t\d+/t$str/" time.gplt
        gnuplot time.gplt
done

But now I have the following questions

1) is it possible to use something like
Code:
n=$(ls -l t?????.dat | wc -l)

to calculate the number of files and then use that to define the number of loops?

2) Also I have the following line in my gnuplot script (time.gplt) which I would like to modify:

Code:
set label at 14,10 '$t=1.0$~ms'

I would like to replace the number after the equal sign in the above code with the variable $str?

Thanks!
 

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