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In order to use ePiX, the directory $INSTALL/bin must be in your PATH (see POST-INSTALL); type
echo $PATH
to see your PATH. If the directory $INSTALL/bin/ is not in your PATH, please read POST-INSTALL or ask someone knowledgeable at your site for help; the procedure varies depending on what shell you use. In any case, you will need to modify your shell's configuration file.