Scala-shell

Bash-like shell implemented in Scala.

Building

In root-directory:

user: ~/scala-shell$ sbt assembly

After that, to launch shell:

user: ~/scala-shell$ cd target/scala-2.11/
user: ~/scala-shell/target/scala-2.11$ scala scalashell-assembly-1.0.jar

Usage

Commands

Currently, following commands are supported natively:

• cat
• echo
• pwd
• wc
• exit

If the command is not recognized by the shell, then it is treated as an external command and resolved by simply calling it in system shell environment.

Features

• pipes (cat file1 file2 | wc)
• variables (foo = "bar", echo $foo => bar)
• weak quoting (in a double quotation marks)
• strong quoting (in a single quotation marks)
• symbol escaping (via backslash)

Distinctions from Bash

• Whitespaces are ignored completely (except for quotations content, of course), so foo = bar, foo= bar and foo=bar are all equivalent and valid expressions
• Pipes are not lazy
• Some commands (like cat or wc) when called without arguments enter interactive-mode, repeatedly prompting user for another line of input and processing it. In bash, one can exit that mode using CTRL-D (EOF) combination. Don't use it, this will cause shell to shut down. Instead, use \quit-keyword.