v1.0.0 — First Stable Release

First stable release of shell-java — a custom POSIX-style shell implementation in Java.

What's New in v1.0.0

• alias — set, list and expand command aliases
• unalias — remove aliases with -a flag to clear all
• Recursive alias expansion with self-reference protection
• Alias names complete via Tab alongside builtins and PATH binaries
• Unit tests for core components (Tokenizer, PathResolver, HistoryManager, JobManager, AliasManager, Environment, OutputWriter, CommandRegistry)
• README with features, usage examples, architecture and release history
• MIT license

Full Feature Set

• Builtin commands: echo, pwd, cd, ls, mkdir, rmdir, touch, cat, type, exit, history, fc, clear, alias, unalias, declare, export, unset, jobs, complete
• I/O redirection: >, >>, 2>, 2>>
• Pipelines: cmd1 | cmd2 | cmd3
• Background execution: command &
• Variable expansion: $VAR, ${VAR}, $?, $$, $!
• History expansion: !!, !n, !prefix
• Tab completion: builtins, PATH executables, files, directories, aliases
• Persistent command history via ~/.shell_java_history
• Job control: background execution and jobs builtin
• Quote handling: single quotes, double quotes, backslash escaping

Changes

See [#9] for full details.

v0.7.0 — Pipes and Variable Expansion

Seventh milestone release adding pipeline execution and variable expansion.

What's New

• | — pipe output of one command into input of another
• cmd1 | cmd2 | cmd3 — multi-stage pipelines
• $VAR / ${VAR} — variable expansion
• $? — last command exit code
• $$ — current shell PID
• $! — last background job PID
• VAR=value — variable assignment syntax
• declare — set and list variables
• export — export variables to environment
• unset — remove variables

Changes

See [#8] for full details.

Notes

Planned for v1.0.0: alias/unalias, unit tests for core components, and README update — marking the first stable release.

v0.6.0 — Command History

Sixth milestone release adding full command history support.

What's New

• Persistent history saved to ~/.shell_java_history across sessions
• HISTFILE — custom history file location
• HISTSIZE — limit number of stored entries (default 1000)
• HISTCONTROL — ignoredups, ignorespace, erasedups, ignoreboth
• history builtin with -r, -w, -a, -c flags
• !! — repeat last command
• !n — run command by number
• !prefix — run last command starting with prefix
• fc builtin with -l flag for listing and rerun by number
• clear builtin to clear terminal screen

Changes

See [#7] for full details.

Notes

Planned for v0.7.0: pipes (|) and variable expansion ($VAR).

v0.5.0 — Job Control

Fifth milestone release adding background job execution and job management.

What's New

• & operator — run commands in background (ping -n 10 127.0.0.1 &)
• Background processes launch immediately, printing [1] <pid>
• jobs — list background jobs with status and +/- markers
• Done jobs appear once on next jobs call then are removed
• Job numbers reset when all jobs are cleared

Changes

See [#6] for full details.

Notes

Planned for v0.6.0: command history (history builtin, persistent history file, Up/Down arrow navigation).

v0.4.0 — Tab Completion

Fourth milestone release adding full tab completion support via JLine3.

What's New

• Tab completes builtin command names
• Tab completes PATH executables (Windows-aware, strips .exe/.bat extensions)
• Tab completes file and directory paths for arguments
• Tab cycles through candidates with repeated presses
• complete -C <script> <command> — register custom completion script
• complete -p <command> — print registered completion spec
• complete -r <command> — remove registered completion spec
• Registered scripts run on Tab with COMP_LINE/COMP_POINT env vars

Changes

See [#5] for full details.

Notes

Planned for v0.5.0: job control.

v0.3.0 — I/O Redirection

Third milestone release adding full I/O redirection support for both builtin and external commands.

What's New

• > — redirect stdout to file (overwrite)
• >> — redirect stdout to file (append)
• 2> — redirect stderr to file (overwrite)
• 2>> — redirect stderr to file (append)
• All builtins and external commands respect redirection
• ParseResult converted to record for cleaner code

Notes

Planned for v0.4.0: tab autocomplete via JLine3.

v0.2.0 — File operations and shell quoting

Second milestone release adding file and directory operation builtins and full POSIX-compliant shell quoting.

What's New

File & Directory Operations (#2)

• ls — list directory contents, sorted alphabetically
• mkdir — create directories including intermediate parents
• rmdir — remove empty directories
• touch — create empty files or update last-modified timestamp
• cat — display file contents
• BuiltinFactory enum for centralized builtin registration

Shell Quoting (#3)

• Single quotes — all characters preserved literally
• Double quotes — literal value except \\, \", $, and `
• Backslash outside quotes — escapes next character
• Backslash inside double quotes — recognized sequences resolved, unrecognized sequences preserve backslash literally
• Empty string preservation — echo "" produces empty string token
• Unterminated quote detection — clean error message, shell continues

Notes

Planned for v0.3.0: I/O redirection (>, >>, <).

v0.1.0 — Initial shell with builtins and external command execution

First milestone release of a custom Java shell implementation supporting an interactive REPL, builtin commands, and execution of external programs via PATH resolution.

Features

• Interactive REPL loop for reading and dispatching commands
• Builtin commands:
  • exit
  • echo
  • pwd
  • cd
  • type — identifies whether a command is a builtin or an external executable
• PATH-based resolution and execution of external programs, with PATHEXT-aware extension matching on Windows
• Graceful handling of unrecognized/invalid commands

Notes

This is an early-stage release focused on core shell mechanics. Planned for
future versions: quoting/escaping, I/O redirection, pipes, and command history.