Loop through similar file extension but different prefix name: Bash script

Question

I have 15 pair of array files for which I need to perform certain operation (say subtraction).
My file names are:

pr1_A.txt
evs1_A.txt
pr2_A.txt
evs2_A.txt
...
pr15_A.txt
evs15_A.txt

I want to perform:

pr1_A - evs1_A
pr2_A - evs2_A
...
pr15_A - evs15_A

Can anybody guide me how to do it using a for loop.

@genisage undelete your answer please, we'll fix it. I think the problem was in the question more tha in your answer. — whoan
– whoan, Commented Jan 19, 2015 at 4:31
please add to your question the information you had provided to genisage — whoan
– whoan, Commented Jan 19, 2015 at 4:32
In my case, r is variable in the file name, x1 = evs_Amon_r1i1p1.txt, y1 = pr_Amon_r1i1p1.txt, x2 = evs_Amon_r2i1p1.txt, y2 = pr_Amon_r2i1p1.txt, x3=evs_Amon_r1i1p2.txt, y3 = pr_Amon_r1i1p2.txt ....etc. Variable is r part of the file name in the middle, which is common for both evs and pr files. — user962808
– user962808, Commented Jan 19, 2015 at 20:13

5 revs · Accepted Answer · 2015-01-19 04:42:10Z

1

for n in evs_Amon*
do
  tmp=${n:3}
  x='pr'$tmp
  y='evs'$tmp
  #do stuff using x and y
done

Is that what you're looking for?

edited Jan 19, 2015 at 4:42

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5 revs
genisage

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2 Comments

user962808 Over a year ago

Thanks for this my n is string actually it is x = pr_Amon_CCSM4_r1i1p1.txt; y = evs_Amon_CCSM4_r1i1p1.txt, then for n =2, x = pr_Amon_CCSM4_r1i1p2.txt; y = evs_Amon_CCSM4_r1i1p2.txt ... for n = 10 x = pr_Amon_CCSM4_r2i1p1.txt; y = evs_Amon_CCSM4_r2i1p1.txt whereas for n = 12, x = pr_Amon_CCSM4_r1i1p6.txt; y = evs_Amon_CCSM4_r1i1p6.txt. How to declair string n in this case ?

whoan Over a year ago

Excelent! +1 for that

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