Slack Webhook Notification Shell Script (curl JSON from Linux Cron)
Send Slack messages from Linux with a Bash script and incoming webhook: curl POST JSON, channel alerts from…
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Grep Log Errors and Alert Shell Script (grep, Slack or Email)
Scan Linux log files for ERROR or CRIT lines with a Bash script: tail window, grep patterns, webhook…
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smartctl on Linux: Check Disk Health (SMART Attributes and Tests)
Run smartctl on Linux to read SMART disk health: smartctl -a, PASSED/FAILED, self-tests, schedule short/long tests, and when…
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Disk Space Alert Shell Script (df Threshold, Email, Cron)
Alert when Linux disk usage crosses a threshold: parse df -P, email warning with df output, per-mount limits,…
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Ping Monitor Shell Script for Linux (Host Down Alert, Cron)
Monitor remote hosts with a Bash ping script: packet loss threshold, email when down, cooldown between alerts, and…
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Check if Process Is Running Shell Script (pgrep, Nagios, Cron)
Use a Bash script with pgrep to verify nginx, mysqld, or any daemon is running — exit 1…
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Load Average Alert Shell Script for Linux (Email, Threshold, nproc)
Monitor Linux load average with a Bash script: compare to CPU count, email when hot, attach top snapshot,…
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watch Command on Linux: Monitor df, ss, and Logs Every Few Seconds
Use watch on Linux to rerun commands on an interval: watch -n 2 df -h, highlight changes with…
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Linux free Command Explained: Memory, available, Swap and When RAM Is Full
Understand free -h on Linux: total, used, free, available, buffers/cache, swap, MemAvailable vs free column, and when to…
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Email Alert on Script Failure Shell Script (mail, Logging for Cron)
Wrap cron jobs with a Bash script that emails admins when a command fails — using mail/mailx, capturing…
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