Answer by ozzy for How to extract duplicate numbers from a log file?

You could use:

grep -oP 'SubscriberNumber=\K(\d+)' logfile | sort -n | uniq -cd

• grep -oP 'SubscriberNumber=\K(\d+)' logfile isolates all individual SubscriberNumbers from your logfile;
• sort -n sorts them numerically, and
• uniq -cd prints any duplicate numbers, i.e. those with multiple occurrences, including a count.