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Java HashSet class is a member of Java collections framework.

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July 12, 2020

Java HashSet implements the Set interface. HashSets are used to store a collection of unique elements.

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Education resources

March 30, 2020

National Geographic Kids Science Lab - Science experiments, videos and articles National Ocean Service (NOAA) Kids - Science activities and resources for kids and educators Lunch Doodles with Mo Willems! - Kennedy Center Education Artist-in-Residence Mo Willems explore ways of writing and making with kids of all ages Scholastic Learn-At-Home Resources - Learning experiences for K-9 Greg Tang Math - Math games and resources for all ages SciShow Kids - Videos explaining scientific concepts for young, curious minds Frontiers for Young Minds - Science articles written by scientists and reviewed by kids The Kid Should See This - STEAM, history, and culture-focused videos for kids of all ages Imagineering in a Box - Lessons on theme park design and engineering via Walt Disney Imagineering, Pixar and Khan Academy BBC Bitesize - Lessons covering math, English, science and more for ages 3-16+ BrainPop - Learning tools covering a variety of subjects BreakoutEDU - Immersive learning g

How to fix Cisco Anyconnect Cookies must be enabled to log in.

April 02, 2021

Cookies must be enabled to log in. Description Message originated from the Cisco ASA. In order to log into the secure gateway, cookies must be enabled. The secure gateway detects that it is unable to correctly set a cookie. Solution Add the domain to the browser list of trusted sites.

Elementary, Middle School Resources

March 30, 2020

Carnegie Mellon University Computer Science Academy - Interactive middle and high school computer science curriculum ABCYa - Reading and math games and activities for grades PreK-6 Zearn.org - Math lessons for grades K-5 Disneynature - Movies and complimentary educational materials for grades 2-6 Scratch - Interactive story, game and animation design from the MIT Media Lab, designed for ages 8 to 16 but available for anyone STMath - Math lessons for grades PreK-8 Prodigy Math - Math programs for grades 1-8 Curriculum Associates - Math and reading activity packs for grades K-8 DK Find Out! - Lessons in subjects such as history, science and coding Listenwise - Non-fiction audio stories covering ELA, social studies and science for grades 2-12 CommonLit - Reading and writing lessons for grades 3-12 Codecademy - Data science and coding lessons for high school and college students

PowerMTA sample virtual PMTA config file

January 04, 2020

Sample PowerMTA virtual PMTA config file # # E-mail address for mailer's administrator (please specify!) # postmaster admin@mydomain.com domain-key my-domain,*,/etc/dkim.key # # Settings per source IP address (for incoming SMTP connections) # < source 127.0.0.1> always-allow-relaying yes # allow feeding from 127.0.0.1 process-x-virtual-mta yes # allow selection of a virtual MTA max-message-size 0 # 0 implies no cap, in bytes smtp-service yes # allow SMTP service allow-mailmerge yes </ source > < source 23.45.67.89> # phplist or oempro installed always-allow-relaying yes # allow feeding from mailer.mydomain.com process-x-virtual-mta yes # allow selection of a virtual MTA max-message-size 0 # 0 implies no cap, in bytes smtp-service yes # allow SMTP service hide-message-source true remove-header Received allow-mailmerge yes </ source > < source 12.23.

Fixed ansible Syntax Error while loading YAML.

July 16, 2020

If you encounter error like this: $ ansible-playbook debug.yml --syntax-check ERROR! We were unable to read either as JSON nor YAML, these are the errors we got from each: JSON: No JSON object could be decoded Syntax Error while loading YAML. mapping values are not allowed in this context The error appears to be in '/home/ec2-user/ansible/debug.yml': line 8, column 14, but may be elsewhere in the file depending on the exact syntax problem. The offending line appears to be: - name: This command will show ip shell: ^ here It is likely an indentation error, Yaml is very strict about the indentations and the spacing. You need to make sure that you have two spaces as indentation for the error of your playbook.

A Certification Authority Authorization (CAA) record is used to specify which certificate authorities (CAs) are allowed to issue certificates for a domain.

June 30, 2023

CAA records allow domain owners to declare which certificate authorities are allowed to issue a certificate for a domain. CAA records also provide a means of indicating notification rules in case someone requests a certificate from an unauthorized certificate authority. If no CAA record is present, any CA is allowed to issue a certificate for the domain. If a CAA record is present, only the CAs listed in the record(s) are allowed to issue certificates for that hostname. Example: $ dig CAA +short sqley.com 128 iodef "mailto:support@sqley.com" 128 issue "digicert.com" 128 issue "entrust.net"

Fixed Windows warning: agent returned different signature type ssh-rsa (expected rsa-sha2-512)

May 02, 2020

On windows: Run ssh-agent.exe ssh-add ssh And you get the warning: warning: agent returned different signature type ssh-rsa (expected rsa-sha2-512) It is because ssh-agent on Windows is using an older signing algorithm that your sever is rejecting. The issue is with ssh-agent version on Windows To fix: Download the latest release from here and substitute the "install-sshd.ps1" script for this one . Then run the replaced "install-sshd.ps1".

Use 'docker scan' to run Snyk tests against images to find vulnerabilities and learn how to fix them

July 19, 2022

How to fix screen Cannot find terminfo entry for 'screen.xterm-256color'

June 20, 2021

Switch back to the terminal app that we first set the screen. For example, switch from Gnome Terminal to LXTerminal. Or Find out which TERM is supported: ls /usr/share/terminfo/x this will give you a list of supported TERMs i.e. xterm xterm-xfree86 set the environment variable: export TERM=xterm-xfree86 and run screen: TERMINFO='/usr/share/terminfo/' screen

PowerMTA pmta command

August 15, 2019

Usage: pmta [options] command where 'options' are: --help display this message --xml display result in XML --dom display result as DOM-like "variables" and where 'command' is one of: clear dnscache domainname check mfrom [--tcp] [--dumppackets] mfrom ip check spf [--tcp] [--dumppackets] ip heloDomain [mailFrom] delete [--dsn] [--queue=domain[/vmta]] [--orig=addr] [--rcpt=addr] [--jobId=id] [--envId=id] [--older-than=time-interval] [--no-accounting] deregister [--user=name] [--local-only] [--retain-unloaded] disable source [--reenable-after=interval] ip domain[/vmta] enable source ip domain[/vmta] list [--queue=domain[/vmta]] [--orig=addr] [--rcpt=addr] [--jobId=id] [--envId=id] [--maxitems=n] [--older-than=time-interval] [--pause] [--priority] [--schedule] pause queue domain[/vmta] pause job jobid register [--user=name] [--label=name] [--webmon-ip=ip] [--webm

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Java HashSet class is a member of Java collections framework.

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