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comm -23 <(ls dir1 |sort) <(ls dir2|sort)
This command will give you files those are in dir1 and not in dir2.
About '<( )'<( ) sign, you can google it as 'process substitution'.
<( )
About '<( )' sign, you can google it as 'process substitution'.
About <( ) sign, you can google it as 'process substitution'.