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# `@yarnpkg/shell`
A JavaScript implementation of a bash-like shell (we use it in Yarn 2 to provide cross-platform scripting). This package exposes an API that abstracts both the parser and the interpreter; should you only need the parser you can check out `@yarnpkg/parsers`, but you probably won't need it.
## Usage
```ts
import {execute} from '@yarnpkg/shell';
process.exitCode = await execute(`ls "$1" | wc -l`, [process.cwd()]);
```
## Features
- Typechecked
- Portable across systems
- Supports custom JS builtins
- Supports pipes
- Supports glob patterns (**only** for files that exist on the filesystem: `ls *.txt`)
- Supports logical operators
- Supports subshells
- Supports variables
- Supports string manipulators
- Supports argc/argv
- Supports the most classic builtins
- Doesn't necessarily need to access the fs
## Help Wanted
- Full glob support (`mv build/{index.js,index.build.js}`, `echo {foo,bar}`, `FOO=a,b echo {$FOO,x}`)
- More string manipulators
## Non-Goals
- Perfect POSIX compliance (basic scripting is enough for now)
- Multiline scripts (we mostly target one-liners)
- Control structures (same reason)