JShell

JShell is a unix-like toy shell with most of the commonly used features and minimal dependencies (only readline to be exact).

This started as a "Build your own shell" challenge by codecrafters to explore c and learn more about stuff like parsers and memory management. Currently, the end goal is to make it fully POSIX compliant and add some more QOL features.

Quickstart

• This project uses Makefile and stores release binary in build/release/shell so you can just run below commands:

git clone https://github.com/jaydamani/JShell
cd JShell
make
build/release/shell

Highlights

• Memory safety (ensured by ASAN)
• Persistent history accross setions¹
• Autocomplete for command names and file paths
• Redirect output with stderr and chaining support

cmd arg1 arg2 > out 2> err_out
cmd > out arg1 2> err_out # This also needs to be valid as per POSIX specification

Roadmap

• Parallel command execution using &
• Pipeline support with more than 2 commands
• Variable and path expansions

Footnotes

1. history is stored in path from HISTFILE environment variable ↩