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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tar.gz Backup Directory Shell Script for Linux (Compress, Verify, Retention)
Backup a Linux directory with tar.gz in a shell script: timestamped archives, optional exclude patterns, test tarball integrity,…
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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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Find and Delete Old Files Shell Script (find -mtime, Dry-Run, Logs)
Delete old files safely on Linux with a Bash script: find -mtime retention, DRY_RUN preview, path allowlist, log…
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Wait for Port Open Shell Script (Bash Loop for MySQL, Redis, Deploy)
Block until a TCP port is open on Linux: Bash wait-for-port script with timeout, sleep interval, and use…
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rsync Backup Shell Script for Linux (SSH, Retention and Cron)
Automate rsync backups on Linux with a Bash script: SSH key auth, --delete mirror option, log each run,…
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nohup on Linux: Run Commands in the Background After SSH Logout
Use nohup on Linux to keep long jobs running after you disconnect: nohup command &, redirect output, disown,…
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Bash Aliases on Linux: bashrc, Safe Shortcuts and System-Wide profile.d
Create Bash aliases on Linux: add to ~/.bashrc, source changes, useful examples, avoid dangerous rm aliases, system-wide /etc/profile.d,…
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Certbot Deploy Hook Shell Script: Reload Nginx After renew (Let’s Encrypt)
Use a Certbot deploy hook shell script on Linux to run nginx -t and reload only when certificates…
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