--- title: "Bash Code Snippets" lang: "en" author: "Mohammad Abu Mattar" canonical: https://mkabumattar.com/bash --- # Bash Code Snippets Browse code snippets written in Bash [All Snippets18](/codesnippets)[Cloud1](/codesnippets/categories/cloud)[Aws5](/codesnippets/categories/aws)[Devops9](/codesnippets/categories/devops)[Automation3](/codesnippets/categories/automation)[Shell scripting6](/codesnippets/categories/shell-scripting)[Productivity3](/codesnippets/categories/productivity)[More…](/codesnippets/categories) [All Snippets18](/codesnippets)[Bash and Python1](/codesnippets/bash-and-python)[Python, Node.js and Go1](/codesnippets/python-nodejs-and-go)[SQL and Python1](/codesnippets/sql-and-python)[Bash7](/codesnippets/bash)[Python5](/codesnippets/python)[Typescript3](/codesnippets/typescript) LanguageAllBash (7)Python (5)Typescript (3)Bash and Python (1)Python, Node.js and Go (1)SQL and Python (1)CategoryAllDevops (9)Shell scripting (6)Aws (5)Automation (3)Productivity (3)Python (3)Backend (2)Database (2)Nodejs (2)Performance (2)Ai ml (1)Async (1)Bash (1)Cloud (1)Computer vision (1)Document processing (1)Linux (1)Networking (1)Security (1)Typescript (1)TagAllDevOps (7)Bash (6)Python (6)Shell Scripting (5)Automation (4)AWS (4)NodeJS (4)Performance (4)Configuration (3)TypeScript (3)Backend (2)Boto3 (2)CI/CD (2)Cloud (2)Concurrency (2)DevTools (2)Environment Variables (2)IAM (2)Linux (2)Microservices (2)POSIX (2)Productivity (2)S3 (2)Terminal (2)AI Models (1)Aiohttp (1)Asyncio (1)AWS SDK v3 (1)BestPractices (1)BigData (1)Caching (1)CloudSecurity (1)Computer Vision (1)Cron (1)CRUD (1)Database (1)DataScience (1)Document Processing (1)DocumentClient (1)Dotenv (1)DynamoDB (1)EC2 (1)Echo (1)Exponential Backoff (1)Flock (1)Go (1)HTTP (1)Indexes (1)Infrastructure (1)Locking (1)Machine Learning (1)MemoryOptimization (1)MLOps (1)MultiEnvironment (1)OCR (1)Open Source (1)Optimization (1)Pid file (1)PostgreSQL (1)Printf (1)QueryOptimization (1)Redis (1)Retry (1)Scripting (1)Scripting Best Practices (1)SecretsManagement (1)SecretsManager (1)Security (1)Shell (1)SQL (1)Text Recognition (1)Validation (1)Vault (1)Zod (1)Zsh (1)SortNewest firstOldest firstA to ZShortest read first [![Bash Script Locking: Prevent Concurrent Runs with a PID File](/_astro/hero.CF-paSMK_vzFHW.webp)](/codesnippets/post/bash-script-locking-pid-file) ## [Bash Script Locking: Prevent Concurrent Runs with a PID File](/codesnippets/post/bash-script-locking-pid-file) - [Bash](/codesnippets/categories/bash) - [Automation](/codesnippets/categories/automation) - 18 Aug 2026 - 04 Mins read Quick Tip Wrap any script that must not run twice at once in a PID-file lock, and a second copy simply exits instead of corrupting your data. The Problem The Problem Cron does not c [#Bash](/codesnippets/tags/bash)[#Pid file](/codesnippets/tags/pid-file)[#Locking](/codesnippets/tags/locking)+3 tags [Bash](/codesnippets/bash) [View Code](/codesnippets/post/bash-script-locking-pid-file) [![Bash Retry Function: Automatically Retry Failing Commands with Exponential Backoff](/_astro/hero.Dap62rVN_Z1q0nar.webp)](/codesnippets/post/bash-retry-function-exponential-backoff) ## [Bash Retry Function: Automatically Retry Failing Commands with Exponential Backoff](/codesnippets/post/bash-retry-function-exponential-backoff) - [Devops](/codesnippets/categories/devops) - [Shell scripting](/codesnippets/categories/shell-scripting) - 20 Jul 2026 - 05 Mins read Quick Tip Wrap any flaky command in one reusable retry function and stop re-running red pipelines by hand. The Problem The Problem Some commands fail for reasons that have nothing to [#Bash](/codesnippets/tags/bash)[#Retry](/codesnippets/tags/retry)[#Exponential Backoff](/codesnippets/tags/exponential-backoff)+3 tags [Bash](/codesnippets/bash) [View Code](/codesnippets/post/bash-retry-function-exponential-backoff) [![Why printf Beats echo in Linux Scripts](/_astro/hero.Dl3YkIwZ_Z1w9hux.webp)](/codesnippets/post/printf-beats-echo-linux-scripts) ## [Why printf Beats echo in Linux Scripts](/codesnippets/post/printf-beats-echo-linux-scripts) - [Shell scripting](/codesnippets/categories/shell-scripting) - [Devops](/codesnippets/categories/devops) - 02 Jan 2026 - 03 Mins read Scripting Tip A script that works on your machine can produce different output on another system. The output command is often the reason. printf behaves the same way across shells, and echo d [#Bash](/codesnippets/tags/bash)[#Shell Scripting](/codesnippets/tags/shell-scripting)[#Printf](/codesnippets/tags/printf)+5 tags [Bash](/codesnippets/bash) [View Code](/codesnippets/post/printf-beats-echo-linux-scripts) [![Essential Bash Variables for Every Script](/_astro/hero.B4bDowyY_YQpD7.webp)](/codesnippets/post/essential-bash-variables) ## [Essential Bash Variables for Every Script](/codesnippets/post/essential-bash-variables) - [Shell scripting](/codesnippets/categories/shell-scripting) - [Devops](/codesnippets/categories/devops) - 26 Dec 2025 - 08 Mins read Overview Quick Tip You know what's worse than writing scripts? Writing scripts that break every time you move them to a different machine. Built-in Bash variables fix that. The problem wi [#Bash](/codesnippets/tags/bash)[#Shell Scripting](/codesnippets/tags/shell-scripting)[#Linux](/codesnippets/tags/linux)+4 tags [Bash](/codesnippets/bash) [View Code](/codesnippets/post/essential-bash-variables) [![Per-App Shell History for Bash](/_astro/hero.Da_6jPH6_Z1EorRD.webp)](/codesnippets/post/bash-per-app-history) ## [Per-App Shell History for Bash](/codesnippets/post/bash-per-app-history) - [Shell scripting](/codesnippets/categories/shell-scripting) - [Productivity](/codesnippets/categories/productivity) - 18 Dec 2025 - 02 Mins read Organize your Bash history per terminal app. Ever jumped between iTerm2, Ghostty, and VS Code's terminal only to have your command history get all mixed up? This Bash snippet keeps things clean b [#Bash](/codesnippets/tags/bash)[#Shell Scripting](/codesnippets/tags/shell-scripting)[#Productivity](/codesnippets/tags/productivity)+3 tags [Bash](/codesnippets/bash) [View Code](/codesnippets/post/bash-per-app-history) [![Per-App Shell History for Zsh](/_astro/hero.DRenzVy__1xwzSL.webp)](/codesnippets/post/zsh-per-app-history) ## [Per-App Shell History for Zsh](/codesnippets/post/zsh-per-app-history) - [Shell scripting](/codesnippets/categories/shell-scripting) - [Productivity](/codesnippets/categories/productivity) - 18 Dec 2025 - 02 Mins read Organize your shell history per terminal app. Ever jumped between iTerm2, Ghostty, and VS Code's terminal only to have your command history get all mixed up? This Zsh snippet keeps things clean b [#Zsh](/codesnippets/tags/zsh)[#Shell Scripting](/codesnippets/tags/shell-scripting)[#Productivity](/codesnippets/tags/productivity)+3 tags [Bash](/codesnippets/bash) [View Code](/codesnippets/post/zsh-per-app-history) [![Check S3 Bucket Existence](/_astro/hero.CWiO4GWV_1YUYTb.webp)](/codesnippets/post/bash-s3-bucket-exists) ## [Check S3 Bucket Existence](/codesnippets/post/bash-s3-bucket-exists) - [Aws](/codesnippets/categories/aws) - [Shell scripting](/codesnippets/categories/shell-scripting) - 11 Jun 2025 - 02 Mins read Quick Tip Don't let your deployment blow up because of a missing S3 bucket. This Bash script lets you check if a bucket exists before anything fails. The Problem Missing bucket failure [#Bash](/codesnippets/tags/bash)[#AWS](/codesnippets/tags/aws)[#DevOps](/codesnippets/tags/devops)+3 tags [Bash](/codesnippets/bash) [View Code](/codesnippets/post/bash-s3-bucket-exists) ### [Categories](/codesnippets/categories) - [Cloud1](/codesnippets/categories/cloud) - [Aws5](/codesnippets/categories/aws) - [Devops9](/codesnippets/categories/devops) - [Automation3](/codesnippets/categories/automation) - [Shell scripting6](/codesnippets/categories/shell-scripting) - [Productivity3](/codesnippets/categories/productivity) - [Bash1](/codesnippets/categories/bash) - [Security1](/codesnippets/categories/security) - [Nodejs2](/codesnippets/categories/nodejs) - [Database2](/codesnippets/categories/database) - [Typescript1](/codesnippets/categories/typescript) - [Backend2](/codesnippets/categories/backend) - [Performance2](/codesnippets/categories/performance) - [Linux1](/codesnippets/categories/linux) - [Python3](/codesnippets/categories/python) - [Async1](/codesnippets/categories/async) - [Networking1](/codesnippets/categories/networking) - [Ai ml1](/codesnippets/categories/ai-ml) - [Computer vision1](/codesnippets/categories/computer-vision) - [Document processing1](/codesnippets/categories/document-processing) ### [Tags](/codesnippets/tags) [#Aws4](/codesnippets/tags/aws)[#Ec21](/codesnippets/tags/ec2)[#Boto32](/codesnippets/tags/boto3)[#Python6](/codesnippets/tags/python)[#Devops7](/codesnippets/tags/devops)[#Automation4](/codesnippets/tags/automation)[#Iam2](/codesnippets/tags/iam)[#Cloud2](/codesnippets/tags/cloud)[#Infrastructure1](/codesnippets/tags/infrastructure)[#Bash6](/codesnippets/tags/bash)[#Shell scripting5](/codesnippets/tags/shell-scripting)[#Productivity2](/codesnippets/tags/productivity)[#Devtools2](/codesnippets/tags/devtools)[#Terminal2](/codesnippets/tags/terminal)[#Configuration3](/codesnippets/tags/configuration)[#Retry1](/codesnippets/tags/retry)[#Exponential backoff1](/codesnippets/tags/exponential-backoff)[#Cicd2](/codesnippets/tags/cicd)[#Shell1](/codesnippets/tags/shell)[#S32](/codesnippets/tags/s3)[#Pid file1](/codesnippets/tags/pid-file)[#Locking1](/codesnippets/tags/locking)[#Flock1](/codesnippets/tags/flock)[#Cron1](/codesnippets/tags/cron)[#Concurrency2](/codesnippets/tags/concurrency)[#Linux2](/codesnippets/tags/linux)[#Environment variables2](/codesnippets/tags/environment-variables)[#Posix2](/codesnippets/tags/posix)[#Vault1](/codesnippets/tags/vault)[#Secretsmanagement1](/codesnippets/tags/secretsmanagement)[#Multienvironment1](/codesnippets/tags/multienvironment)[#Security1](/codesnippets/tags/security)[#Nodejs4](/codesnippets/tags/nodejs)[#Typescript3](/codesnippets/tags/typescript)[#Secretsmanager1](/codesnippets/tags/secretsmanager)[#Cloudsecurity1](/codesnippets/tags/cloudsecurity)[#Dynamodb1](/codesnippets/tags/dynamodb)[#Aws sdk v31](/codesnippets/tags/aws-sdk-v3)[#Crud1](/codesnippets/tags/crud)[#Documentclient1](/codesnippets/tags/documentclient)[#Zod1](/codesnippets/tags/zod)[#Validation1](/codesnippets/tags/validation)[#Dotenv1](/codesnippets/tags/dotenv)[#Backend2](/codesnippets/tags/backend)[#Postgresql1](/codesnippets/tags/postgresql)[#Queryoptimization1](/codesnippets/tags/queryoptimization)[#Indexes1](/codesnippets/tags/indexes)[#Performance4](/codesnippets/tags/performance)[#Sql1](/codesnippets/tags/sql)[#Database1](/codesnippets/tags/database)[#Microservices2](/codesnippets/tags/microservices)[#Printf1](/codesnippets/tags/printf)[#Echo1](/codesnippets/tags/echo)[#Scripting best practices1](/codesnippets/tags/scripting-best-practices)[#Aiohttp1](/codesnippets/tags/aiohttp)[#Asyncio1](/codesnippets/tags/asyncio)[#Http1](/codesnippets/tags/http)[#Scripting1](/codesnippets/tags/scripting)[#Memoryoptimization1](/codesnippets/tags/memoryoptimization)[#Datascience1](/codesnippets/tags/datascience)[#Mlops1](/codesnippets/tags/mlops)[#Bigdata1](/codesnippets/tags/bigdata)[#Bestpractices1](/codesnippets/tags/bestpractices)[#Redis1](/codesnippets/tags/redis)[#Caching1](/codesnippets/tags/caching)[#Go1](/codesnippets/tags/go)[#Optimization1](/codesnippets/tags/optimization)[#Ocr1](/codesnippets/tags/ocr)[#Computer vision1](/codesnippets/tags/computer-vision)[#Document processing1](/codesnippets/tags/document-processing)[#Open source1](/codesnippets/tags/open-source)[#Ai models1](/codesnippets/tags/ai-models)[#Machine learning1](/codesnippets/tags/machine-learning)[#Text recognition1](/codesnippets/tags/text-recognition)[#Zsh1](/codesnippets/tags/zsh)