Sergei Waigant sergeiwaigant

Semantic Commit Messages

See how a minor change to your commit message style can make you a better programmer.

Format: <type>(<scope>): <subject>

<scope> is optional

Example

OpenSSL 🔐

Install

Install the OpenSSL on Debian based systems

sudo apt-get install openssl

Reference https://stackoverflow.com/a/34407620/13287790

$ printf %s 'encode this'|jq -sRr @uri
encode%20this
$ jq -rn --arg x 'encode this' '$x|@uri'
encode%20this
-r (--raw-output) outputs the raw contents of strings instead of JSON string literals. -n (--null-input) doesn't read input from STDIN.

-R (--raw-input) treats input lines as strings instead of parsing them as JSON, and -sR (--slurp --raw-input) reads the input into a single string. You can replace -sRr with -Rr if your input only contains a single line, or if you don't want to replace linefeeds with %0A:

Here are several different ways to test a TCP port without telnet.

Source: https://gist.github.com/Khoulaiz/41b387883a208d6e914b

BASH (man page)

$ cat < /dev/tcp/127.0.0.1/22
SSH-2.0-OpenSSH_5.3
^C

	sudo iptables -A PREROUTING -t nat -i eth0 -p tcp --dport 80 -j REDIRECT --to-port 8080
	sudo iptables -A PREROUTING -t nat -i eth0 -p tcp --dport 443 -j REDIRECT --to-port 8443
	sudo sh -c "iptables-save > /etc/iptables.rules"
	sudo apt-get install iptables-persistent

	#allows localhost traffic to connect to 443 from 8443
	sudo iptables -t nat -A OUTPUT -o lo -p tcp --dport 443 -j REDIRECT --to-port 8443

	function bashLogger() {
	local logLevel="INFO"
	local logMessage=""

	[[ $# -ge 1 ]] && { logMessage=$1;shift;}
	[[ $# -ge 1 ]] && { logLevel=${logMessage}; logMessage=$1; shift;}

	local additionalMessages="$@"
	local timestamp=$(TZ=UTC-1 date +'%Y-%m-%d %H:%M:%S,%3N')

	# Remove all untagged images
	docker rmi $(docker images \| grep "^<none>" \| awk '{print $3}')

	#
	docker container prune

	# clean up all "Exited" containers
	docker rm $(docker ps -a \| grep Exited \| awk '{ print $1 }')