Compare/Difference of two arrays in Bash

arrays bash diff compare
Kiran picture Kiran · Feb 22, 2010 · Viewed 88.6k times · Source

Is it possible to take the difference of two arrays in Bash. What is a good way to do it?

Code:

Array1=( "key1" "key2" "key3" "key4" "key5" "key6" "key7" "key8" "key9" "key10" )
Array2=( "key1" "key2" "key3" "key4" "key5" "key6" ) 

Array3 =diff(Array1, Array2)

Array3 ideally should be :
Array3=( "key7" "key8" "key9" "key10" )

Answer

Ilya Bystrov picture Ilya Bystrov · Jan 27, 2015 
echo ${Array1[@]} ${Array2[@]} | tr ' ' '\n' | sort | uniq -u

Output

key10
key7
key8
key9

You can add sorting if you need

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