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  1. BEGIN { FS= "" }
  2. { for (i=1; i<=length($0) ; i++) {
  3.       if (i % 2 == 0) { macaddr=macaddr $i ":" } 
  4.       else { macaddr = macaddr $i }
  5.   }
  6.   print gensub(":$","","g",macaddr)
  7.   macaddr=""
  8. }
Success #stdin #stdout 0.01s 4276KB
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stdin
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412010000018
412010000026
412010000034
stdout
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41:20:10:00:00:18
41:20:10:00:00:26
41:20:10:00:00:34
https://ideone.com/Gd4Tp
language:
AWK (gawk 4.2.1)
created:
11 years ago
visibility:
public

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