They're written in Perl. Take a look at the sources: tmp: http://conway.rutgers.edu/~ccshan/wiki/blog/posts/Higher-order_shell/tmp http://conway.rutgers.edu/~c

They're written in Perl. Take a look at the sources: tmp: http://conway.rutgers.edu/~ccshan/wiki/blog/posts/Higher-order_shell/tmp http://conway.rutgers.edu/~ccshan/wiki/blog/posts/Higher-ord... keep: http://conway.rutgers.edu/~ccshan/wiki/blog/posts/Higher-order_shell/keep http://conway.rutgers.edu/~ccshan/wiki/blog/posts/Higher-ord...