Usage:

• Run as an interactive shell with make;./nush or pass optional script input with make;./nush [SCRIPT]
• exit with ^D or exit

nush supports seven operators:

• Redirect input: nush$ sort < foo.txt
• Redirect output: nush$ sort foo.txt > output.txt
• Pipe: sort foo.txt | uniq
• Background: sleep 10 &
• And: true && echo one
• Or: true || echo one
• Semicolon: echo one; echo two