HP R4.2 - Manual (Page 509)

A
Summary of Commands explain
UCS 1000 R4.2 Administration 585-313-507 Issue 3 April 2000 470
second example has a truncated file name, because file names are limited to
14 characters in most UNIX systems and if you want to use source code
control, then the file name must not be longer than 12 characters. The
recommended way to store an explanation is under a file name related to the
mnemonic
{msgID} rather than the { CLASS}nnn name, since the later is
meaningless. A file name of the form {CLASS}nnn does not provide a
sophisticated user with much information about the contents of the file, while
the mnemonic form does. If the mnemonic is longer than 12 characters, then
you should create a shorter name related to the mnemonic that is unique
within 12 characters.
The following environment variables affect the behavior of edExplain
EDITOR
This is the name of your preferred text editor. The default is vi.
EXPLAINDIR
This is the directory in which the explanation directories are found. The
default is ${PRODUCTROOT}/gendb/data/explain
.
PRODUCTROOT
This is the installation directory. The default is /.
VERBOSITY
This is a debugging aid. Setting it to anything cause debugging output to
be generated while edExplain performs its job.