Aleph commands (dlib, "cd $aleph_proc") etc. not working

Description

A new Aleph instance was working OK, but after running Upgrade Express unsuccessfully, nothing in Aleph is working: 
"dlib usm01" gives "dlib: Command not found"; 
"cd $aleph_proc" gives "aleph_proc: Undefined variable"'; 
"upgrade_util" gives "Command not found";
etc. 

Resolution

This can happen when the $alephe_root/aleph_start is missing or severely defective.  
In this case the Upgrade Express log showed:
"Renaming /exlibris/aleph/u23_1/alephe to /exlibris/aleph/u23_1/alephe.orig"
But (because of a space problem) the import of the source ./alephe did not occur.  Thus, there was no ./alephe at all.

This was resolved by doing this:

> cd /exlibris/aleph/u23_1
> cp -pr alephe.orig alephe

and then starting a new (duplicate) session.

• Article last edited: 9-May-2016