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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Bash Functions Shell Script: Reusable Blocks, Arguments and local Variables
Structure Linux Bash scripts with functions: pass arguments, use local variables, return codes, and a small deploy-style example…
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Cron Job Wrapper Shell Script: flock, Logging and Duplicate-Run Prevention
Prevent overlapping cron jobs on Linux with a Bash wrapper: flock locks, unified timestamps, log per job name,…
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Bash Read CSV File Line by Line Shell Script (IFS, Validation, Logging)
Parse CSV files in Bash safely: while read loop, IFS commas, skip header row, validate fields, and log…
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JSON API Health Check Shell Script (curl, HTTP Codes and jq)
Monitor HTTP JSON APIs from Linux with a Bash script: curl status codes, optional jq field checks, timeouts,…
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/etc Configuration Backup Shell Script for Linux (tar, Retention, Restore Hint)
Back up /etc on Linux with a Bash script: compressed tar archives, dated filenames, retention cleanup, and notes…
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Bash Error Handling Shell Script: trap, set -euo pipefail and Safe Wrappers
Write safer Bash scripts with set -euo pipefail, ERR/EXIT traps, structured logging, and a reusable wrapper that records…
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Linux Environment Variables: export, PATH, profile.d and systemd
Set Linux environment variables: export, echo, /etc/profile.d, ~/.bashrc, systemd Environment= and EnvironmentFile=, PATH, and debug with printenv.
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Elasticsearch Index Cleanup Shell Script (Auto-Delete Old Indices)
Automatically delete old date-suffixed Elasticsearch or OpenSearch indices with a Bash script, controlling disk usage without needing Curator…
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Docker Volume Backup Shell Script for Linux (tar + Restore)
Back up and restore Docker named volumes on Linux with a Bash script using a helper container and…
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