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A comment on Shell Magic: Set Operations with uniq. Parent comment

Re:Shell Magic: Set Operations with uniq by scintill76 on Tuesday May 29, 2018 @07:56PM (#17183777)
Note that this is a bash feature; other shells may have different syntax.
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Re:Shell Magic: Set Operations with uniq by hawski on Wednesday May 30, 2018 @08:44AM (#17187203)
It's the same in ksh at least, so one is covered in the BSDs. It could be also implemented as a separate tool, but not as convenient, because of additional quoting - I did once.
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