j33ty

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-- Copied from https://www.alexedwards.net/blog/using-postgresql-jsonb

-- Create a table with a JSONB column.
CREATE TABLE items (
    id SERIAL PRIMARY KEY,
    attrs JSONB
);

-- You can insert any well-formed json input into the column. Note that only
-- lowercase `true` and `false` spellings are accepted.

j33ty

# fluxctl cheatsheet

## Use different namespace than default for flux daemon.
export FLUX_FORWARD_NAMESPACE={kube_ns}
fluxctl --k8s-fwd-ns={kube_ns} list-workloads

## List all workloads
fluxctl list-workloads

## List all workloads in all namespaces

j33ty

# Local port forwarding
# Forward all the requests on localhost:8000 to restricted-domain.com:80 via remote-server.com
ssh -L 8000:restricted-domain.com:80 user@remote-server.com

# Remote port forwarding
# Forward all requests to remote-server.com:8000 to your localhost:3000
ssh -R 8000:localhost:3000 user@remote-server.com

j33ty

GnuPG is a complete and free implementation of the OpenPGP standard.

Exporting keys

• Export key to file: gpg -o key.gpg --export <KEY ID>
• Export key in ASCII: gpg -o key.asc --export --armor <KEY ID>

Note: Omitting the -o|--output option will print the key to stdout.

Importing keys

• gpg --import key.gpg

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Variable substitution

$\{var:-word}: If var is null or unset, word is substituted for var. The value of var does not change.

$\{var:=word}: If var is null or unset, var is set to the value of word.

$\{var:?message}: If var is null or unset, message is printed to standard error. This checks that variables are set correctly.

$\{var:+word}: If var is set, word is substituted for var. The value of var does not change.

j33ty

package main

import (
    "runtime"
    "fmt"
    "time"
)

func main() {
    // Print our starting memory usage (should be around 0mb)

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/*
***********************************************
  psql -h host -U user db: Connect to database
  psql -E: Describe the underlaying queries of the \ commands
  psql -l: List all database and exit

  \q: Quit
  \c db_name: Switch database
  \l: Show databases
  \d table_name: Show table info

j33ty

curl -ks registry/v2/_catalog | jq '.["repositories"] | join(" ")' | tr -d '"'
curl -ks registry/v2/go/tags/list | jq .
curl -ks registry/v2/_catalog | jq .

j33ty

let regex;

/* matching a specific string */
regex = /hello/; // looks for the string between the forward slashes (case-sensitive)... matches "hello", "hello123", "123hello123", "123hello"; doesn't match for "hell0", "Hello" 
regex = /hello/i; // looks for the string between the forward slashes (case-insensitive)... matches "hello", "HelLo", "123HelLO"
regex = /hello/g; // looks for multiple occurrences of string between the forward slashes...

/* wildcards */
regex = /h.llo/; // the "." matches any one character other than a new line character... matches "hello", "hallo" but not "h\nllo"
regex = /h.*llo/; // the "*" matches any character(s) zero or more times... matches "hello", "heeeeeello", "hllo", "hwarwareallo"