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Nov 23rd, 2017
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  1. var1="1, 2, 3, 4"; var2="3, 4, 5, 6"
  2. comm -3 <(grep -oP 'd+' <<<"$var1" | sort) <(grep -oP 'd+' <<<"$var2" | sort) |
  3. tr -d 't' |
  4. paste -sd,
  5.  
  6. 1,2,5,6
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