bash shell in /system/bin. If you start a shell through ADB (eg. ./adb shell), it'll start /system/bin/sh as a shell which is a symlink to bash. Unfortunately ADB does not add the -l option to the shell's commandline, thus the shell will not be a login shell and it'll not look for _any_ configuration files. 
.* wildcard in Bash, it will match the . and .. entries as well. I've seen not just once users executing this in a directory:rm -r * .*.* matches .. too,
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