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74f2b97322
Fix PR#50 while maintaining backward compatibility: when new environment variable $KEEPQUOTE is set, use the command line's original single and double quotes unchanged (rather than removing all quotes and adding double quotes as needed). Fix PR#123: do not ignore command line characters following a ";" that was not preceeded by a command. Add signal handler for SIGTTIN (background read attempted from control terminal) that prints a message and quits the shell. This is needed because gsh will sometimes receive such a signal, go into the "suspended" state, and never return to "running" state. Add environment variable $ECHOX to print expanded commands before they are executed.