[Solved] bash: compare 2 files, then output third file with same pattern [closed]

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awk one liner

awk '{if(NR>1)system("grep -w ^"$2" <file2>");}' <file1>

Also many other solutions are there, check join or in awk itself without using grep, simply by storing the first files content in an array, it can be done,

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solved bash: compare 2 files, then output third file with same pattern [closed]