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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/tmp Cleanup Shell Script for Linux (find, Age, Allowlist and Safety)
Clean stale files under /tmp safely with a Bash script: mtime threshold, size summary, allowlist paths, dry-run mode,…
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Bash getopts Shell Script: Parse -d -r Flags for Linux CLI Tools
Build proper Linux CLI scripts with getopts: -h help, -d directory, -r retention days, validate combinations, and print…
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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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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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