Linux Administration

Network Devices (Hub, Repeater, Bridge, Switch, Router, Gateways and Brouter) - GeeksforGeeks https://www.geeksforgeeks.org/network-devices-hub-repeater-bridge-switch-router-gateways/

How to create an email alert for SSH logins | TechRepublic https://www.techrepublic.com/article/how-to-create-an-email-alert-for-ssh-logins/

How to monitor an xDSL Modem using a Prometheus Exporter plugin and Grafana Agent on Grafana Cloud with Grafana OnCall | Grafana Labs https://grafana.com/blog/2023/03/17/how-to-monitor-an-xdsl-modem-using-a-prometheus-exporter-plugin-and-grafana-agent-on-grafana-cloud-with-grafana-oncall/

How to handle P1, Major Issues (MI), and SLA-based issues? https://www.maximaconsulting.com/newsroom/how-to-handle-p1-incidents-sla-issues#:~:text=1)%20The%20Application%20teams%20reach,the%20global%20application%2Fdatabase%20environments.

Linux Administrator job description template | TalentLyft https://www.talentlyft.com/en/resources/linux-administrator-job-description

How to Build an Auto-scaling Group of AWS EC2 Instance | by Hasan Cheema | Oct, 2022 | Towards AWS https://towardsaws.com/how-to-build-an-auto-scaling-group-of-aws-ec2-instance-a71956c1a31

Free Practice Exam Questions | AWS SysOps Administrator Associate https://digitalcloud.training/aws-sysops-administrator-associate-free-practice-exam-questions/

Regex Tip [a-z] matches all lower case letters. [-az] matches '-', 'a', or 'z'.

Two files in different formats (eg. TSV vs. CSV) and need to find out if file1 had lines that were not in file2. join -v1 --header -t, -1 2 -2 1 <( sort -t, -k2 files1.csv | cut -d, -f1-5 ) <( sed 's/\t/,/g' files2.tsv | sort -t, -k1 )

Linux and Unix Test Disk I/O Performance With dd Command - nixCraft https://www.cyberciti.biz/faq/howto-linux-unix-test-disk-performance-with-dd-command/

If you want to clean empty directories, find command can make the job easy: $ find / -type d -empty -exec rmdir {} + The -type d option searches for directories, -empty select empty ones and -exec rmdir {} executes the rmdir command to delete them. The rmdir command ensures that the directory is empty before deleting it. Alternatively, you can also use below command to complete the same task: $ find / -type d -empty -delete

# stat -c "%F"$'\t'"%15s"$'\t'"%n" -- * | awk -F"[\t\.]+" '/^regular file.*\..{1,5}$/{t[$NF]+=$2;x[$NF]++} END {for (s in t){printf("%-5s %4i %12i\n",s,x[s],t[s])}}' | sort -k3n Command to See what type of files are taking up so much space. output columns = type count