..without creating a temporary file:
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diff -y <(ls First_directory) <(ls Second_directory) |
The -y is just to show a side-by-side comparison. Very handy! And the result?
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[jorge@j-laptop temp]$ diff -y <(ls First_directory) <(ls Second_directory) common.txt common.txt first_file.txt | second_file.txt |
Thanks to my colleague Ingvar for showing me this!