Justin Chu justinchuch

## bit_shift_operations
Left shift:

x << n = x * 2^n

Example:
if x = 1, n = 3

1 << 3 = 1 * (2^3) = 8

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## docker_commands
# build docker image from current directory
docker build -t <tag name> .

# remove docker image
docker rmi <tag name>

# remove docker image that is exited
docker rm $(docker ps -a -q -f status=exited)

# run docker image

## find_and_replace_text
find . -type f -name '*.xml' -exec sed -i '' s/target=\"1.4\"/target=\"1.6\"/ {} +
	Left shift:

	x << n = x * 2^n

	Example:
	if x = 1, n = 3

	1 << 3 = 1 * (2^3) = 8

	--- --- --- --- --- ---
	# build docker image from current directory
	docker build -t <tag name> .

	# remove docker image
	docker rmi <tag name>

	# remove docker image that is exited
	docker rm $(docker ps -a -q -f status=exited)

	# run docker image