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#!/bin/sh

...
      print unless exists $excludehash{ $1 }
    }
  }' "excludefile" "datafile"

#!/bin/sh

...
      print
    }
  }' "excludefile" "datafile"

1@1
Last, First

random lines of data
YOURKEY: 1@1
...

random lines of data
YOURKEY: Apple's

#!/bin/sh

...
      }
    }
  }' "datafile"