https://DevOpsCloud.io -- Cloud Monk Losang Jinpa, Ph.D., MCSE/MCT, GitOps DevOps Engineer

Bash - Bash Shell - Bourne-again shell - Bash (Unix Shell)

Bash Unix shell

The default shell for Linux users is bash, also known as the Bourne-Again Shell.

Snippet from Wikipedia: Bash (Unix shell)

In computing, Bash (short for "Bourne Again SHell,") is an interactive command interpreter and command programming language developed for UNIX-like operating systems. Created in 1989 by Brian Fox for the GNU Project, it is supported by the Free Software Foundation and designed as a 100% free alternative for the Bourne shell (sh) and other proprietary Unix shells.

Since its inception, Bash has gained widespread adoption and is commonly used as the default login shell for numerous Linux distributions. It holds historical significance as one of the earliest programs ported to Linux by Linus Torvalds, alongside the GNU Compiler (GCC). It is available on nearly all modern operating systems, making it a versatile tool in various computing environments.

As a command-line interface (CLI), Bash operates within a terminal emulator, or text window, where users input commands to execute various tasks. It also supports the execution of commands from files, known as shell scripts, facilitating automation. In keeping with Unix shell conventions, Bash incorporates a rich set of features. The keywords, syntax, dynamically scoped variables, and other basic features of the language are all copied from the Bourne shell, (sh). Other features, e.g., history, are copied from the C shell, (csh), and the Korn Shell, (ksh). It is a POSIX-compliant shell with extensions.

Creative Commons Attribution-Share Alike 4.0

Fair Use Sources:

• https://rosettacode.org/wiki/Category:Bash

Bash Programming Language, Bash Shell, Bash Scripting, Bash Command Line, Bash Command, Bash Variable, Bash Environment Variable, Bash PATH Variable, Bash cd Command, Bash ls Command, Bash echo Command, Bash if Statement, Bash for Loop, Bash while Loop, Bash until Loop, Bash case Statement, Bash function Definition, Bash array Variable, Bash associative Array, Bash declare Command, Bash typeset Command, Bash local Variable, Bash global Variable, Bash positional Parameters, Bash $0 Variable, Bash $1 Variable, Variable, Bash $* Variable, Bash $@ Variable, Bash $, Bash $$ Variable, Bash $! Variable, Bash $- Variable, Bash IFS Variable, Bash PS1 Prompt, Bash PS2 Prompt, Bash PS4 Prompt, Bash HOME Variable, Bash USER Variable, Bash HOSTNAME Variable, Bash OSTYPE Variable, Bash SHELL Variable, Bash TERM Variable, Bash exit Command, Bash return Command, Bash break Command, Bash continue Command, Bash read Command, Bash printf Command, Bash test Command, Bash [ Command, Bash [[ Command], Bash builtin Command, Bash type Command, Bash command Command, Bash hash Command, Bash alias Command, Bash unalias Command, Bash set Command, Bash shopt Command, Bash export Command, Bash unset Command, Bash readonly Command, Bash trap Command, Bash wait Command, Bash kill Command, Bash jobs Command, Bash fg Command, Bash bg Command, Bash disown Command, Bash exec Command, Bash time Command, Bash times Builtin, Bash source Command, Bash . Command (Dot Command), Bash eval Command, Bash complete Command, Bash compgen Command, Bash compopt Command, Bash history Command, Bash fc Command, Bash pushd Command, Bash popd Command, Bash dirs Command, Bash pwd Command, Bash oldpwd Variable, Bash command Substitution, Bash $( ) Syntax, Bash Backticks `...`, Bash Variable Substitution, Bash Parameter Expansion, Bash ${var} Syntax, -default}, =default}, Bash ${var, +replacement}, var}, Bash ${var%pattern}, Bash ${var%%pattern}, pattern}, #pattern}, length}, Bash Arithmetic Expansion, Bash $(( expression )) Syntax, Bash (( ... )) Arithmetic, Bash Globbing, Bash Filename Expansion, Bash Wildcard *, Bash Wildcard , Bash Character Class [...], Bash Brace Expansion, Bash {1..10} Expansion, Bash {a,b,c} Expansion, Bash Tilde Expansion, Bash ~ User Home Expansion, Bash ~+ Expansion ($PWD), Bash ~- Expansion ($OLDPWD), Bash aliasing Commands, Bash .bashrc File, Bash .bash_profile File, Bash .profile File, Bash .bash_login File, Bash .bash_history File, Bash /etc/bashrc File, Bash /etc/profile File, Bash elif Keyword, Bash else Keyword, Bash fi Keyword, Bash Arithmetic Conditions (( )), Bash String Comparisons, Bash Integer Comparisons (-eq, -ne, -gt, -lt), Bash File Conditions (-f, -d, -e, -r, -w, -x), | !, Bash Pipeline Operator, Bash pipefail Option, Bash Redirection >, Bash Redirection >>, Bash Redirection <, Bash Redirection << (Here-Doc), Bash Redirection <<< (Here-String), Bash Redirection &>, Bash Redirection 2>, Bash Redirection &>>, Bash Redirection 2>>, Bash Redirection >, Bash noclobber Option, Bash Built-in Commands, Bash test Builtin, Bash Arithmetic Command (( )), Bash compgen Builtin, Bash environment Files, Bash read -p Prompt, Bash read -r Raw Input, Bash mapfile Command, Bash mapfile -t Option, Bash shopt -s histappend, Bash shopt -s cdspell, Bash shopt -s checkwinsize, Bash shopt -s cmdhist, Bash shopt -s dotglob, Bash shopt -s extglob, Bash shopt -s extdebug, Bash shopt -s globstar, Bash shopt -s histreedit, Bash shopt -s histverify, Bash shopt -s hostcomplete, Bash shopt -s interactive_comments, Bash shopt -s login_shell, Bash shopt -s mailwarn, Bash shopt -s nocaseglob, Bash shopt -s nocasematch, Bash shopt -s nullglob, Bash shopt -s progcomp, Bash shopt -s promptvars, Bash shopt -s sourcepath, Bash shopt -s xpg_echo, Bash BASH_VERSION Variable, Bash BASH_VERSINFO Array, Bash BASHOPTS Variable, Bash BASH_ALIASES Array, Bash BASH_ARGC Array, Bash BASH_ARGV Array, Bash BASH_CMDS Array, Bash BASH_LINENO Array, Bash BASH_SOURCE Array, Bash BASH_SUBSHELL Variable, Bash BASH_XTRACEFD Variable, Bash BASH_REMATCH Array, Bash COMP_CWORD Variable, Bash COMP_LINE Variable, Bash COMP_POINT Variable, Bash COMP_WORDS Array, Bash COMP_KEY Variable, Bash COMP_TYPE Variable, Bash COMP_REPLY Array, Bash COLUMNS Variable, Bash EUID Variable, Bash GROUPS Array, Bash HISTCMD Variable, Bash HOSTTYPE Variable, Bash LINENO Variable, Bash MACHTYPE Variable, Bash OPTARG Variable, Bash OPTIND Variable, Bash PPID Variable, Bash PWD Variable, Bash RANDOM Variable, Bash SECONDS Variable, Bash SHELLOPTS Variable, Bash SHLVL Variable, Bash UID Variable, Bash set -e Option, Bash set -u Option, Bash set -x Option, Bash set -o pipefail, Bash set -o nounset, Bash set -o errexit, Bash set -o xtrace, Bash set -o noglob, Bash set -o ignoreeof, Bash set -o vi, Bash set -o emacs, Bash PROMPT_COMMAND Variable, Bash PROMPT_DIRTRIM Variable, Bash completion (Tab Completion), Bash arithmetic $(( )) again for clarity, Bash (( ... )) Double Paren, Bash coproc Command, Bash co-processes, Bash read -s Silent Input, Bash read -n N Characters, Bash exec Redirection, Bash exec >file, Bash exec <file, Bash exec 3>file, Bash exec 3<file, Bash exec 3<>file, Bash test -f Check, Bash test -d Check, Bash test -r Check, Bash test -w Check, Bash test -x Check, Bash test -s Check, Bash test -z Empty String Check, Bash test -n Non-empty String, Bash test -eq Integer Equal, Bash test -ne Integer Not Equal, Bash test -gt Greater Than, Bash test -lt Less Than, Bash test -ge Greater Equal, Bash test -le Less Equal, Bash declare -i Integer Variable, Bash declare -r Read-only, Bash declare -x Export Variable, Bash printf Formatting, Bash shift Command, (Colon) No-Op, Bash true Command Builtin, Bash false Command Builtin, Bash export -f Function Export, Bash read -a Read into Array, Bash read -d Delimiter, Bash read -t Timeout, Bash compgen -A function, Bash compgen -A alias, Bash compgen -A builtin, Bash compgen -A command, Bash compgen -A file, Bash ulimit Command, Bash dirs stack Command, Bash fc -s Redo Command, Bash globstar ** Pattern, Bash extglob @(), !(), *(), +(), , Bash suspend Command, Bash jobs -l Option, Bash jobs -p Option, Bash kill -l List Signals, Bash kill -s Send Signal By Name, Bash disown -r Option, Bash fc -e Editor Mode, Bash readarray Command, Bash cd -P Option, Bash cd -L Option, Bash set +o Disable Option, Bash BASH_ENV Variable, Bash shopt -s cdable_vars, Bash shopt -s autocd, Bash shopt -s dirspell, Bash globstar ** repeated concept for emphasis, Bash SIGINT Trap, Bash SIGTERM Trap, Bash cd oldpwd with cd - used conceptually, Bash read -s for password input, Bash read -n for limited chars, Bash exec 3>&1 duplicate fd, Bash exec 2>&1 redirect stderr to stdout, Bash command substitution in $( ) repeated concept, Bash arrays indexing ${array[0]}, array[@]}, Bash associative arrays declare -A, Bash indexing associative arrays ${assoc[key]}, Bash advanced completion with complete command, Bash bind Keybindings, Bash bind -P Show Keybindings, Bash bind -S Show Settable Options, Bash bind -X Show Keyseq Functions, Bash line editing vi mode repeated concept, Bash line editing emacs mode repeated concept, Bash fc -l List history range, Bash fc -r Reverse order history listing, Bash dirs +N Switch Stacks, Bash dirs -N Switch Stacks, Bash dirs -p Print One per Line, Bash dirs -l Long Listing, Bash kill -9 Hard Kill, Bash kill -INT Interrupt, Bash kill -TERM Terminate

Bash: bashrc, Bash Fundamentals, Bash Inventor - Bash Language Designer: Brian Fox on June 8, 1989 at urging of Richard Stallman of Free Software Foundation (FSF); Chet Ramey is now the maintainer. Bash Scripting, Bash DevOps - Bash SRE, Cloud Native Bash (Bash on Kubernetes - Bash on AWS - Bash on Azure - Bash on GCP), Bash Microservices, Bash Containerization (Bash Docker - Bash on Docker Hub), Serverless Bash, Bash Data Science - Bash DataOps - Bash and Databases (Bash ORM), Bash ML - Bash DL, Functional Bash (1. Bash Immutability, 2. Bash Purity - Bash No Side-Effects, 3. Bash First-Class Functions - Bash Higher-Order Functions, Bash Lambdas - Bash Anonymous Functions - Bash Closures, Bash Lazy Evaluation, 4. Bash Recursion), Reactive Bash), Bash Concurrency - Bash Parallel Programming - Async Bash, Bash Networking, Bash Security - Bash DevSecOps - Bash OAuth, Bash Memory Allocation (Bash Heap - Bash Stack - Bash Garbage Collection), Bash CI/CD - Bash Dependency Management - Bash DI - Bash IoC - Bash Build Pipeline, Bash Automation - Bash Scripting, Bash Package Managers, Bash Modules - Bash Packages, Bash Installation (Bash Windows - Chocolatey Bash, Bash macOS - Homebrew Bash, Bash on Linux), Bash Configuration, Bash Observability (Bash Monitoring, Bash Performance - Bash Logging), Bash Language Spec - Bash RFCs - Bash Roadmap, Bash Keywords, Bash Operators, Bash Functions, Bash Data Structures - Bash Algorithms, Bash Syntax, Bash OOP (1. Bash Encapsulation - 2. Bash Inheritance - 3. Bash Polymorphism - 4. Bash Abstraction), Bash Design Patterns - Bash Best Practices - Bash Style Guide - Clean Bash - Bash BDD, Bash Generics, Bash I/O, Bash Serialization - Bash Deserialization, Bash APIs, Bash REST - Bash JSON - Bash GraphQL, Bash gRPC, Bash Virtualization, Bash Development Tools: Bash SDK, Bash Compiler - Bash Transpiler, Bash Interpreter - Bash REPL, Bash IDEs (JetBrains Bash, Bash Visual Studio Code), Bash Linter, Bash Community - Bashaceans - Bash User, Bash Standard Library - Bash Libraries - Bash Frameworks, Bash Testing - Bash TDD, Bash History, Bash Research, Bash Topics, Bash Uses - List of Bash Software - Written in Bash - Bash Popularity, Bash Bibliography - Bash Courses, Bash Glossary - Bash Official Glossary, Bash GitHub, Awesome Bash. (navbar_bash)