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linux - How to duplicate string in bash?

I have the following string in bash

str="kallel"

I want to create from str an str2. The str2 contains str duplicated till the length = 20. So the result should be like this:

str2="kallelkallelkallelka"

How to do in in bash?

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1 Answer

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by (71.8m points)

This should work:

str="kallel"
str2="${str}"
while (( ${#str2} < 20 ))
do
  str2="${str2}${str}"
done
str2="${str2:0:20}"

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