locate -br '^settings.xml$'
From man locate:
locate reads one or more databases prepared by updatedb(8) and writes
file names matching at least one of the PATTERNs to standard output,
one per line.
-b, --basename
Match only the base name against the specified patterns. This
is the opposite of --wholename.
-r, --regexp REGEXP
Search for a basic regexp REGEXP. No PATTERNs are allowed if
this option is used, but this option can be specified multiple
times.
The ^ and $ ensure that only files whose name is settings.xml and not files whose names contain settings.xml will be printed.
You may need for the first time to run: updatedb
(as root) to update/build the database of locate.
apt-get install -y dnsutils
apt-get install -y bind-utils
$!
contains the process ID of the most recently executed background pipeline.