#!/bin/bash
if awk -Wv 2>/dev/null | head -1 | grep -q '^mawk'; then
    uniq_linebuffered() {
      awk -W interactive '$0 != l { print ; l=$0 ; fflush(); }' "$@"
    }
else
    uniq_linebuffered() {
      awk '$0 != l { print ; l=$0 ; fflush(); }' "$@"
    }
fi