bash - serialized numbers in text files with for loop and sed -


i want put serialized numbers on defined positions in text file. idea use character patterns in file, count variable , put them using sed in file. tried this:

for number in 1 2 3 4 ;   sed -ibak "s/var/$number" file.txt > file2.txt done

(the arguments 1 2 3 ... not best solution, think, should work)

with code , tiny variations of it, different results, no success. can cut/paste pattern in text, last argument inserted (="3"). why doesn´t sed take iterated variable? (which counted up, tested echo).

the first iteration replaces var 1, next iteration replaces same var 2, etc. - because operate on same input every time, , pattern isn't dynamic.

it's not clear want achieve, it's hard provide working solution.

it might easier reach perl:

perl -pe 's/picvar/"pic" . ++$i/e'

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