🖥️ system_monitor.sh - System Monitoring Script

A feature-rich Bash script to monitor Linux systems, generate reports, and manage scheduled runs using cron.

v2 enables more features

📌 Features

• Colorized console output
• Per-core CPU and memory usage
• Disk, LVM, and network stats
• Service monitoring
• Scheduled execution via cron
• Export to .txt, .csv, .html

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📊 Monitored System Information

Section	Details
Disk Usage	All non-overlay mount points with percent usage
Memory	Derived from /proc/meminfo
CPU Load	1, 5, 15 min averages from /proc/loadavg
Per-Core Stats	User/system/idle times from /proc/stat
Active Users	who sessions, sorted and counted
Services	Status of: ssh, cron, nginx, fail2ban
System Info	Hostname, uptime, kernel, and OS version
LVM Info	PVs, VGs, and LVs with size and usage via pvs, vgs, and lvs
Network Stats	RX/TX bytes per interface from /proc/net/dev

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📤 Export Options

Use --export <path> to generate reports:

Extension	Description
.txt	Full plain-text snapshot
.csv	Key-value table for Excel/CSV
.html	Pretty web-style formatted page

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🕓 Scheduling via Cron

Option	Description
--schedule	Adds a cron job: daily @ 6am
--list-jobs	Lists this script's current cron jobs
--schedule-remove	Removes cron jobs related to this script

📝 Logs saved to:

/var/log/sys_monitor/cron_sys_monitor.log

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🛠️ Usage

./system_monitor.sh --service ssh
./system_monitor.sh --service-all
./system_monitor.sh --export /tmp/report.html
./system_monitor.sh --schedule
./system_monitor.sh --list-jobs
./system_monitor.sh --schedule-remove

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📄 License

MIT (c) 2025 Joel E. White