Cleanup the "hup" function - quote properly, and test for the pid
file existing (with something in it) before simply using it, so the
error message can be controlled, rather than just sh's cannot open file msg.

branches: 1.8.4;
Source /etc/shrc only if it exists. Inspired by PR install/37209.

branches: 1.7.8;
Factor out common settings from /root/.shrc and /etc/skel/.shrc to a
new file /etc/shrc.

As proposed on tech-userlevel.

Fix syntax error in r1.5 -- semicolon needed before closing brace on same line.

Also make hup work in single user; revert dot.cshrc to atatat's version,
and make equivalent for dot.shrc.

Use "head -1" as a generic way to snarf the first line of the pid file;
also works with the existing alias in dot.shrc.

Add RCSid.

Minor change:
Don't use a backquote expression to get the host name; use a pattern
substitution on lop-nor.ihack.net instead.

branches: 1.1.2; 1.1.4;
(Ab?)use some sh(1) features:
* Put the aliases in a separate file, referenced by $ENV, so that they're
present in subshells.
* Do the same to make `set -o emacs' happen automatically in interactive
shells. (Yay, line editing by default!)
* Use `export FOO=bar' syntax, as it's shorter and other sh(1)-like shells
all support it these days.