When you enter bash, it sometimes not reading the .bash_history file.
EAGLE> bash --version
GNU bash, version 4.3.46(1)-release (alpha-dec-vms)
Copyright (C) 2013 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later http://gnu.org/licenses/gpl.html
It turns out that this bug is triggered by enabling DECC$FILENAME_ENCODING_UTF8.