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Hits
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### command 1 ###
cat hits.txt | ... | xargs echo "number of visits:"
### command 2 ###
cat hits.txt | ... | xargs echo "number of different IP addresses:"
### command 3 ###
cat hits.txt | ... | xargs echo "number of different countries:"
### command 4 ###
cat hits.txt | ... | xargs echo "number of different cities:"
### command 5 ###
cat hits.txt | ... | xargs echo "minimal number of hits per country:"
### command 6 ###
cat hits.txt | ... | xargs echo "maximal number of hits per country:"
### command 7 ###
cat hits.txt | ... | xargs echo "minimal number of IP addresses per country:"
### command 8 ###
cat hits.txt | ... | xargs echo "maximal number of IP addresses per country:"
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