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  1. #!/bin/bash
  2. s='abcd 10001.'
  3. perl -pe 's/(?!^).(?!$)/$&\n$&/g' <<< "$s"
Success #stdin #stdout 0s 4988KB
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Standard input is empty
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ab
bc
cd
d 
 1
10
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00
01
1.
https://ideone.com/BTDnoz
language:
Bash (bash 5.0.3)
created:
5 years ago
visibility:
secret

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