mysqladmin --user=root --password=test_pass stop-slave

mysqladmin --user=root --password stop-slave

$ & !  [ ] < > `

mysql --password=pa$$word     # does not work
mysql --password='pa$$word'   # works
mysql --password=pa$$word   # works, but slightly unclear what's going on at first glance

mysql --password="like'this" # password has a single quote in the middle
mysql --password='like"this' # password with a double quote in the middle

$ echo foo$bar
foo                # literal 'foo' plus the (empty) shell variable $bar

$ echo foo$bar
foo$bar            # backslash prevents expansion of $bar as a variable

$ echo "foo$$bar"  # weaker double quote doesn't prevent expansion so
foo9691bar         # the $$ expands to the unix process id (pid) of the current shell

$ echo 'foo$$bar'
foo$$bar           # "stronger" single quote prevents shell expansion

$ echo "foo'bar"
foo'bar            # double quote allows single quote within the literal