Linux Admin Cheat Sheet

Table Of Contents

• Linux Admin Cheat Sheet
  • Table Of Contents
  • Monitoring

Monitoring

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Realtime counting unique IP addresses in access log

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• while true; do clear; tail -100 /var/log/httpd/access_log | awk '{print $2}' | uniq -c | sort -nr| head -10; sleep 2; done
  • The uniq command in Linux is used for removing duplicate lines from a file. Use option '-c' to get the count of repeated lines.

Realtime counting number of files currently open by Java application

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• watch 'cd /proc/$(pidof java)/fd && ls -l | wc -l'