Disk Space Warning Script
Copy a disk space warning bash script using df, thresholds, cron, and email alerts. Monitor Linux se...
Full guide →$bash-snippets
Bash Script Library
30 copy-paste bash scripts with plain-English explanations. Tested on Ubuntu 22.04 LTS and macOS Ventura.
30scripts
10free tools
0logins required
Beginner Scripts (12)
Automated File Backup
Accidental deletion or disk failure permanently destroys data with no undo on Linux. Timestamps each...
Full guide →Quick System Info Report
Guessing server state during an outage costs response time. One bash script snapshots hostname, upti...
Full guide →Search Files for Text with grep
Opening files manually to find a pattern across a codebase wastes time. grep -rn searches every file...
Full guide →Check If Website Is Up
Discovering a site is down from a user complaint means hours of lost traffic already gone. curl -s a...
Full guide →Bash If/Else Examples
Comparison operator mistakes in bash scripts cause silent logic failures on unexpected input. Covers...
Full guide →Create a Dated Folder
Backup directories without timestamps overwrite previous runs and sort unpredictably. date +%Y-%m-%d...
Full guide →Find Large Files in Linux
Your disk hit 100% and the server stopped. Find the biggest files and directories fast with du and f...
Full guide →Kill Process on Port
EADDRINUSE means something is squatting on your port. Find the process with lsof or ss, then kill it...
Full guide →List All Open Ports on Linux
A bash script that maps every port your server is listening on, along with the process name holding...
Full guide →Docker Cleanup Bash Script — Reclaim Disk Space from Docker Garbage
A bash script that removes stopped containers, unused images, dangling volumes, and build cache from...
Full guide →Bash For Loop Examples
A for loop over the output of ls word-splits on filenames with spaces and silently skips files. Loop...
Full guide →Intermediate Scripts (18)
Delete Old Log Files
Unmanaged log files silently fill /var/log until disk writes fail and services crash. find -mtime de...
Full guide →Bash Error Handling with set -euo pipefail
Bash silently continues after failed commands by default — a broken cd followed by rm -rf destroys t...
Full guide →Kill a Process with pkill and pgrep
The ps/grep/copy-PID/kill workflow takes four steps every time you need to stop a process. pkill by...
Full guide →File Permissions Security Audit
World-writable files on a web server let any compromised script overwrite your application. find -pe...
Full guide →Monitor CPU and RAM Usage
A runaway process consuming 100% CPU goes undetected until the server becomes unresponsive. top -bn1...
Full guide →Send Email Alerts from Bash
Monitoring scripts without email alerts mean failures go unnoticed until users report them. Wraps ma...
Full guide →MySQL Database Backup Script
A mistaken DROP TABLE or storage failure permanently destroys database data with no built-in undo. m...
Full guide →SSH Key Setup Script
Password-based SSH is vulnerable to brute-force attacks and credential leaks on any internet-exposed...
Full guide →Find Duplicate Files in Linux
Duplicate files accumulate silently in archives and download folders, wasting gigabytes of disk spac...
Full guide →Restart a Service If It Stopped
A crashed nginx or postgresql stays down for hours without a watchdog to detect and recover it. syst...
Full guide →Rsync Remote Backup
A local-only backup dies with the machine. Push an incremental, resumable copy to a remote server wi...
Full guide →Check SSL Certificate Expiry with Bash
A bash script that connects to any domain over TLS, reads the certificate, and tells you how many da...
Full guide →Read a File Line by Line in Bash
A while-read loop silently dropped the last server in a monitoring list because the file had no trai...
Full guide →Bash Functions and Arguments
A function reused the variable name 'target' without declaring it local, overwrote the caller's vari...
Full guide →Bash Functions: Return Values, Local Scope, and Reusable Logic
A bash function cannot return a string with return — that keyword sets an exit code only. Use echo p...
Full guide →Bash Arrays: Indexed, Associative, Append, and Safe Iteration
Storing a list as a space-separated string breaks the moment one element contains a space, splitting...
Full guide →Bash Argument Parsing: Positional Args, getopts, and Long Flags
A script that reads $1 as a value will accept --env as that value and deploy nowhere, silently. Pars...
Full guide →Bash String Manipulation: Substrings, Replace, and Parameter Expansion
Field-counting with cut -d/ -f3 returns the wrong slice the moment a URL gains an s for https. Param...
Full guide →Free Interactive Tools
Need a cron expression? chmod calculator?
10 browser-based bash tools — no install required
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The Production Bash Toolkit
6 scripts + shared library + 52-page field guide. The production layer the free snippets don't cover.
Get the Toolkit →