Tick is a esolang created in 2017. It has only 4 commands and an infinite memory tape. It is made to also ignore non-command characters. It is an incomplete TrivialBrainfuckSubstitution.
>: Move selector to the next cell <: Move selector to the previous cell +: Increment memory cell. Truncate overflow: 255+1=0 *: Add ascii value of memory cell to output stream
The following is a hello world program in Tick
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ *+++++++++++++++++++++++++++++*+++++++**+++*>+++++++++++++++++++++++++++ +++++*<++++++++*>+++++++++++++++++++++++++++++++++++++++++++++++++++++++ ++++++++++++++++++++++++*+++*>++++++++++++++++++++++++++++++++++++++++++ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*>++++ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ++++++++++++++++++++++++*>+++++++++++++++++++++++++++++++++*
As it is a Trivial Brainfuck Substitution the interpreter is equally trivial.
#!/usr/bin/ruby eval 'm=Hash.new(p=0);'+ARGF.read.gsub( /./, '>' => 'p+=1;', '<' => 'p-=1;', '+' => 'm[p]+=1;', '*' => 'putc m[p];')