Enhanced TENEX C shell

Question

etcsh is an enhanced version of the original tcsh, which is a version of the original Berkeley C shell implementing file name completion and command line editing.

etcsh features the following enhancements and fixes over the original tcsh.

• Function declarations;

• read to variables from pipes and redirections;

• comments on interactive sessions;

• tell whether stdin is empty or not;

• variable expansion on expressions corrected;

• piped built-ins are forked;

• missing test built-in implemented;

• read-write variable flag;

• exit shall cancel lists.

More is to come. Feedbacks and contributions are much appreciated.