Create a csv file with '5-digits prefix' phone numbers, as well as occurrences per prefix

cut -d, -f1 /var/opt/example/dumpfile.130610_subscriber.csv | cut -c3-5 | sort | uniq -c | sed -e 's/^ *//;/^$/d' | awk -F" " '{print $2 "," $1}' > SubsxPrefix.csv
dumpfile is a CSV file, which its 1st field is a phone number in format CC+10 digits Empty lines are deleted, before the output in format "prefix,ocurrences"
Sample Output
$ cat SubsxPrefix.csv
52551,392
52842,93
52843,193

0
2013-07-17 07:58:56

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