🖊️
Today I Learned
  • Home(ish) for Things I've Learned
  • 🦄General
    • Agile Development
      • Tips for dealing with Humans
      • Definition of Done (DOD)
      • Inclusiveness
      • OKRs
      • Roles
      • 12 Principles of Agile
      • Zettel
      • Cognitive Bias
        • Present Bias
        • Sunk cost fallac
        • Ikea Effect
    • Architecture Development
      • Architectural-"ilities"
      • Architectual Considerations
    • Devops
      • Check The Status of All Services
      • Running Out Of inode Space
      • SSL Certificates Can Cover Multiple Domains
    • Documentation
      • 🧜Mermaid
        • 🧜Mermaid-Flowchart
        • 🧜‍♀️Mermaid-Sequence
        • 🧜‍♂️Mermaid-Gnatt
      • ⬇️Markdown
      • MediaWiki
    • Networking
      • Applications
        • NMAP
        • Scappy
        • TCP Dump
        • Wireshark
      • Common Ports
      • Cabling
      • Protocols
        • BGP
        • EIGRP
        • First Hop Redundancy
        • IEEE 802.1X
        • IEEE 802.11 WLAN
        • IP Security
        • IPv4 Multi-cast
        • IPv4 Subnetting
        • IPv6
        • IS-IS
        • OSPF
        • Point to Point
        • RIP
        • Spanning Tree
      • Technologies
        • Frame Mode MPLS
        • IOS (Cisco)
        • Network Address Translation
        • Quality of Service
        • VLANs
        • VOIP Basics
      • Resolve The Public IP Of A URL
      • Path Of The Packets
      • Determine The IP Address Of A Domain
      • Allow HTTPS Through Your UFW Firewall
      • Allow Cross-Origin Requests To Include Cookies
    • Virtualization
      • Ubuntu
        • Ubuntu Quick Install
        • Hyper-V - Setup an Ubuntu 20.04 vm
        • Virtual Box - Setup an Ubuntu 20.04 vm
        • Virtual Box - Setup an Ubuntu 22.04 vm
      • RedHat
        • Setup RHEL 9.2 Linux vm
      • Fedora
        • Setup Fedora 38 Linux vm
      • Transfer files from Windows to Linux VM
    • Security/Hacking
      • Reference
        • Big Data Security
        • Cryptography
        • Code Reviews
        • Forensic Challenges
        • PenTesting Challenges
        • PKI
        • VOIP
        • Virus Classification
        • VMs and Live CDs
        • Worm Classification
      • Forensics
      • Tests
        • Browser Plugins
        • Infrastructure tests
        • Security Tests
        • Securing Home Computers
        • Web Application Security Test
        • VPN
        • Wireless Network Review
      • Tools
        • Metasploit - 4.5
  • 💻os
    • 🐧linux
      • Reference
      • ubuntu-specific
        • Upgrading Ubuntu
        • Check Ubuntu Version
        • Config ubuntu 20.04 vm for rdp
      • alias
        • Ignore The Alias When Running A Command
      • crypto
        • Generate A SAML Key And Certificate Pair
      • datetime
        • Figure Out The Week Of The Year From The Terminal
        • Show Current System Time And Settings
        • Configure Your Server Timezone
        • Get The Unix Timestamp
        • Touch Access And Modify Times Individually
        • Format And Print The Current Date And Time
      • disk
        • Display Free Disk Space
        • Show Disk Usage For The Current Directory
      • directory
        • Change To That New Directory
        • Check The Current Working Directory
        • Configure cd To Behave Like pushd In Zsh
        • Display The Contents Of A Directory As A Tree
        • Copying Nested Directories With Ditto
        • Globbing For Filenames In Zsh
        • Globbing For All Directories In Zsh
        • Use fzf To Change Directories
        • Show The Size Of Everything In A Directory
        • List The Stack Of Remembered Directories
      • file
        • Copying File Contents To System Paste Buffer
        • Do Not Overwrite Existing Files
        • File Type Info With File
        • Find Files With fd
        • Find Newer Files
        • Get Matching Filenames As Output From Grep
        • Hexdump A Compiled File
        • List Files Ordered By Modification Date
        • List Names Of Files With Matches
        • List Stats For A File
        • Create A File Descriptor with Process Substitution
        • Print Out Files In Reverse
        • Securely Remove Files
        • Print A Range Of Lines For A File With Bat
      • http
        • Curl With Cookies
        • Curling For Headers
        • Curling With Basic Auth Credentials
      • history
        • Jump To The Ends Of Your Shell History
        • Last Argument Of The Last Command
        • Global Substitution On The Previous Command
        • Search History
      • java
        • List The Available JDKs
      • networking
        • Check If A Port Is In Use
        • Kill Everything Running On A Certain Port
        • Map A Domain To localhost
        • List Of Sessions To A Machine
      • package management
        • Get Repo's
        • Hold package version - do not upgrade
        • Install a Specific Version of Package
        • Switch Versions of a Brew Formula
        • Switch between Local & remote packages
      • process
        • PID Of The Current Shell
        • Open The Current Command In An Editor
        • List Parent pid With ps
        • Check If Command Is Executable Before Using
        • Exclude Certain Files From An rsync Run
        • List The Statuses Of All Upstart Jobs
        • Do A Dry Run Of An rsync
        • Where Are The Binaries?
        • Watch This Run Repeatedly
      • shells
        • Change Default Shell For A User
      • terminal
        • Clear The Screen
        • Cat Files With Color Using Bat
        • Display All The Terminal Colors
        • Cat A File With Line Numbers
        • Less With Style
        • View A Web Page In The Terminal
        • Undo Some Command Line Editing
        • Command Line Length Limitations
        • Saying Yes
        • Watch The Difference
      • string
        • Repeat Yourself
      • ssh
        • Killing A Frozen SSH Session
        • Forward Multiple Ports Over SSH
        • SSH Escape Sequences
        • Specify The Language For A File With Bat
        • SSH With Port Forwarding
      • search/query
        • Count The Number Of Matches In A Grep
        • Enable Multi-Select Of Results With fzf
        • Exclude A Directory With Find
        • Find A File Installed By Brew
        • Grep For Files With Multiple Matches
        • Grep For Multiple Patterns
        • Grep For Files Without A Match
        • Partial String Matching In Bash Scripts
        • Only Show The Matches
        • Search Files Specific To A Language
        • Search Man Page Descriptions
        • Show A File Preview When Searching With FZF
        • Use Regex Pattern Matching With Grep
        • Skip Paging If Output Fits On Screen With Less
        • Sort In Numerical Order
      • user
        • List All Users
      • variables
        • All The Environment Variables
        • Compare Two Variables In A Bash Script
        • Provide A Fallback Value For Unset Parameter
        • Check If The First Argument Is Given
    • 🍎mac
      • Access All Screen And Video Capture Options
      • Access System Information On OS X
      • Access Unsupported Screen Resolutions With RDM
      • Clean Up Old Homebrew Files
      • Convert An HEIC Image File To JPG
      • Default Screenshot Location
      • Disable Swipe Navigation For A Specific App
      • Display A Message With Alfred
      • Find The Process Using A Specific Port
      • Gesture For Viewing All Windows Of Current App
      • Insert A Non-Breaking Space Character
      • List All The Say Voices
      • Quickly Type En Dashes And Em Dashes
      • Require Additional JS Libraries In Postman
      • Resize App Windows With AppleScript
      • Resizing Both Corners Of A Window
      • Run A Hardware Check
      • Run AppleScript Commands Inline In The Terminal
      • Set A Window To Its Default Zoom Level
      • Specify App When Opening From Command Line
      • Use Default Screenshot Shortcuts With CleanShot X
      • View All Windows Of The Current App
    • 🪟win
      • Windows Reference
      • powershell
        • Formatting
        • Base64
        • Environment Variables
        • Modules
          • Pwsh Profile
          • Logging.psm1
        • Setup console with posh-git
    • 🚇wsl
      • Install Jupyter in WSL
  • 👩‍💻programmy
    • azure
      • Setup Azure VM Ubuntu Server to be Desktop
      • Azure Cli
        • Azure Repos Export
        • Azure Keyvault
        • Azure Functions
        • Azure Networking
          • Setup VPN Certificates
        • Azure Subscriptions
        • Azure Roles
          • Azure Storage Ac
    • aad
      • AzureAD.Get-Devices
      • Desktop Joining/Trust
    • databases
      • mysql
        • Display Output In A Vertical Format
        • Doing Date Math
        • Dump A Database To A File
        • List Databases And Tables
        • Show Create Statement For A Table
        • Show Tables That Match A Pattern
        • Show Indexes For A Table
      • mongodb
        • Determine The Database Version
        • Dump A Remote Database
        • Get Size Stats For A Collection
        • List Size Stats For All Collections
      • mssql
      • postgres
        • commands
          • Triggers
          • Use A psqlrc File For Common Settings
          • Switch The Running Postgres Server Version
          • Track psql History Separately Per Database
          • Toggling The Pager In PSQL
          • Temporarily Disable Triggers
          • Sets With The Values Command
          • Set A Statement Timeout Threshold For A Session
          • Send A Command To psql
          • Sleeping
          • Set Inclusion With hstore
          • Prepare, Execute, And Deallocate Statements
    • linux
      • Limit Execution Time Of Statements
      • Install Postgres With uuid-ossp Using asdf
      • Find The Location Of Postgres Config Files
      • Find The Data Directory
      • Create hstore From Two Arrays
      • Insert Just The Defaults
      • Stop a Service
      • Is App Installed?
        • Change The Current Directory For psql
        • Check If The Local Server Is Running
        • connections
          • Connect To An RDS PostgreSQL Database
          • Terminating A Connection
          • List Connections To A Database
          • Force SSL When Making A psql Connection
        • Crypto
          • Salt And Hash A Password With pgcrypto
          • Set A Seed For The Random Number Generator
          • Generating UUIDs With pgcrypto
          • Compute The md5 Hash Of A String
          • Compute Hashes With pgcrypto
        • Database Operations
          • List Database Objects With Disk Usage
          • List All The Databases
          • Get The Size Of A Database
          • Dump All Databases To A SQL File
          • Duplicate A Local Database
          • Dump And Restore A Database
          • Create Database Uses Template1
        • DateTime Operations
          • Timestamp Functions
          • Using Intervals To Offset Time
          • Turning Timing On
          • Intervals Of Time By Week
          • Convert A String To A Timestamp
          • Day Of Week For A Date
          • Determining The Age Of Things
          • Day Of Week By Name For A Date
          • Constructing A Range Of Dates
          • Configure The Timezone
        • Functions
          • List All Versions Of A Function
          • Group By The Result Of A Function Call
          • Edit Existing Functions
        • File Operations
          • Extracting Nested JSON Data
          • Export Query Results To A CSV
        • IDE/Display
          • Auto Expanded Display
          • Clear The Screen In psql
          • Clear The Screen In psql (2)
        • Indexing
          • Use Argument Indexes
          • Using Expressions In Indexes
          • Adding Composite Uniqueness Constraints
          • Add Foreign Key Constraint Without A Full Lock
          • Create A Composite Primary Key
          • Create An Index Without Locking The Table
          • Add ON DELETE CASCADE To Foreign Key Constraint
        • Math Operations
          • Two Ways To Compute Factorial
          • Integers In Postgres
          • Generate Series Of Numbers
          • Count The Number Of Trues In An Aggregate Query
          • Count Records By Type
          • Count How Many Records There Are Of Each Type
          • Assumed Radius Of The Earth
          • Compute The Levenshtein Distance Of Two Strings
        • Queries
          • Write A Query Result To File
          • Union All Rows Including Duplicates
          • Truncate All Rows
          • Use Not Valid To Immediately Enforce A Constraint
          • Storing Emails With citext
          • Print The Query Buffer In psql
          • Prevent A Query From Running Too Long
          • Insert A Bunch Of Records With Generate Series
          • Find Records That Have Multiple Associated Records
          • Find Records That Contain Duplicate Values
          • Between Symmetric
          • Difference Between Explain And Explain Analyze
          • Creating Conditional Constraints
          • Aggregate A Column Into An Array
        • Schema
          • pg Prefix Is Reserved For System Schemas
          • List All Columns Of A Specific Type
          • Default Schema
        • Sequence
          • Restart A Sequence
          • Renaming A Sequence
          • List Available Schemas
        • String Operations
          • Two Ways To Escape A Quote In A String
          • Word Count for a Column
          • String Contains Another String
          • Pretty Printing JSONB Rows
          • Pretty Print Data Sizes
          • Escaping String Literals With Dollar Quoting
          • Escaping A Quote In A String
          • Capitalize All The Words
          • A Better Null Display Character
        • Table Operations
          • Restarting Sequences When Truncating Tables
          • Temporary Tables
          • Renaming A Table
          • Truncate Tables With Dependents
          • List All Rows In A Table
          • Get The Size Of A Table
          • Get A Quick Approximate Count Of A Table
          • Fizzbuzz With Common Table Expressions
          • Find Duplicate Records In Table Without Unique Id
          • Create Table Adds A Data Type
          • Check Table For Any Oprhaned Records
        • Types & Operators
          • Special Math Operators
          • The nullif Function
          • Types By Category
          • Shorthand Absolute Value Operator
          • Show All Versions Of An Operator
          • Switch Non-Castable Column Type With Using Clause
          • Remove Not Null Constraint From A Column
          • List Various Kinds Of Objects
          • Max Identifier Length Is 63 Bytes
          • Lower Is Faster Than ilike
          • Is It Null Or Not Null?
          • Getting A Slice Of An Array
          • Get The Size Of An Index
          • Generate A UUID
          • Generate Random UUIDs Without An Extension
          • Determine Types Of JSONB Records
          • Defining Arrays
          • Creating Custom Types
          • Checking The Type Of A Value
          • Checking Inequality
        • User Operations
          • Who Is The Current User
          • List Database Users
      • pgbouncer
        • Backup Databse
        • pgbouncer
    • c#
    • chrome
      • Access A Value Logged To The Console
      • Chrome Supports Many Unix Keyboard Shortcuts
      • Copy Some Data From The Console
      • Duplicate The Current Tab
      • Easier Access To Network Throttling Controls
      • Pretty Print Tabular Data
      • Reference The Selected Node
      • Selecting DOM Elements Faster Than Ever
      • Simulating Various Connection Speeds
      • Toggle Device Mode
      • Toggle Open The Console Drawer
      • View Network Traffic For New Tabs
    • clojure
      • Aggregation Using merge-with
      • Argument Requirements For A Function
      • Combinations Of Items From A Sequence
      • Define Something Only Once
      • Evaluate One Liners With lein-exec
      • Expanding Macros
      • Get The Value Of An Environment Variable
      • List Functions For A Namespace
      • Load A File Into The REPL
      • Mapping With An Index
      • Open JavaDocs
      • Pretty Print The Last Thing
      • Quick Clojure Docs
      • Reductions
      • Set Max Heap Size
      • Specify the Directory of a Shell Command
      • Splitting On Whitespace
      • Swap Two Items in a Vector
      • Try A Clojure Project In The REPL
      • Type of Anything
      • When Overflow Is Desired
    • css
      • Add Fab Icons To Your Site With FontAwesome 5
      • Animate Smoothly Between Two Background Colors
      • Apply Multiple Box Shadows To Single Element
      • Apply Styles Based On Dark-Mode Preferences
      • Apply Styles To The Last Child Of A Specific Type
      • Change The Orientation Of An Image
      • Circular Icons With A Massive Border Radius
      • Clean Up Repetition With :is() Pseudo-Class
      • Conditional Styling For Unsupported CSS Features
      • Create A Pulsing Background With CSS Animation
      • Define CSS Custom Properties With CSS Variables
      • Define HSL Colors With Alpha Values
      • Display Responsive iframe Maintaining Aspect Ratio
      • Dry Up SCSS With Mixins
      • Give Elements The Same Width With Flexbox
      • Let Pointer Events Pass Through An Element
      • Lighten And Darken With CSS Brightness Filter
      • Lighten And Darken With SCSS
      • Make A Block Of Text Respect New Lines
      • Parameterized SCSS Mixins
      • :root Has Higher Specificity Than html
      • Style A Background With A Linear Gradient
      • Using Maps In SCSS
    • elixir
      • All Values For A Key In A Keyword List
      • Append To A Keyword List
      • Assert An Exception Is Raised
      • Binary Representation Of A String
      • Check For A Substring Match
      • Check List Membership
      • Comparing DateTime Structs
      • Compute Intermediate Values In A With Construct
      • Compute md5 Digest Of A String
      • Counting Records With Ecto
      • Create A Date With The Date Sigil
      • Create A List Of Atoms
      • Creating A PID
      • Creating Indexes With Ecto
      • Defining Multiple Clauses In An Anonymous Function
      • Determine The Latest Release Of A Hex Package
      • Do You Have The Time?
      • Do You Have The Time? - Part 2
      • Documentation Lookup With Vim And Alchemist
      • Dynamically Generating Atoms
      • Execute Raw SQL In An Ecto Migration
      • Expose Internal Representation
      • Include Captures With String.split
      • Inspecting The Process Message Queue
      • List Functions For A Module
      • Listing Files In IEx
      • Match On A Map In A With Construct
      • Passing Around And Using Modules
      • Pattern Matching In Anonymous Functions
      • Pipe Into A Case Statement
      • Quitting IEx
      • Range Into List Using Comprehensions
      • Refer To A Module Within Itself
      • Referencing Values In IEx's History
      • Remove One List From Another
      • Replace Duplicates In A Keyword List
      • Requiring Keys For Structs
      • Reversing A List
      • Reversing A List - Part 2
      • Root Directory Of A Project
      • Round Floats To Integers
      • Run ExUnit Tests In A Deterministic Order
      • Run The Test At A Specific Line Number
      • Same Functions Should Be Grouped Together
      • Skip A Specific Test
      • String Interpolation With Just About Anything
      • Unique Indexes With Ecto
      • Updating Values In A Map
      • Using When Clauses In A With Construct
      • Virtual Fields With Ecto Schemas
      • When Things Don't Match The With Statements
      • Word Lists For Atoms
    • go
      • Access Go Docs Offline
      • Build For A Specific OS And Architecture
      • Not So Random
      • Replace The Current Process With An External Command
      • Sleep For A Duration
      • Upgrading From An Older Version On Mac
    • heroku
      • Wipe A Heroku Postgres Database
      • Push Non-master Branch To Heroku
    • html
      • Adding Alt Text To An Image
      • Disable Auto-Completion For A Form Input
      • Prevent Search Engines From Indexing A Page
      • Render Text As Superscript
      • Submit A Form With A Button Outside The Form
    • javascript
      • Accessing Arguments To A Function
      • Basic Date Formatting Without A Library
      • Character Codes from Keyboard Listeners
      • Check Classes On A DOM Element
      • Check If Something Is An Array
      • Check The Password Confirmation With Yup
      • Compare The Equality Of Two Date Objects
      • Computed Property Names In ES6
      • Conditionally Include Pairs In An Object
      • Configure Jest To Run A Test Setup File
      • Create A Cancelable Promise With PCancelable
      • Create An Array Containing 1 To N
      • Create An Object With No Properties
      • Create Bootstrapped Apps With Yarn
      • Create Future And Past Dates From Today
      • Custom Type Checking Error Messages With Yup
      • Default And Named Exports From The Same Module
      • Define A Custom Jest Matcher
      • Destructure With Access To Nested Value And Parent Value
      • Destructuring The Rest Of An Array
      • Enable ES7 Transforms With react-rails
      • Ensure Shell Can Find Global npm Binaries
      • Easy Date Comparison With DayJS
      • Expand Emojis With The Spread Operator
      • Fill An Input With A Ton Of Text
      • Find Where Yarn Is Installing Binaries
      • for...in Iterates Over Object Properties
      • Formatting Values With Units For Display
      • Freeze An Object, Sorta
      • Generate Random Integers
      • Get The Location And Size Of An Element
      • Get The Response Status From An Axios Error
      • Get The Time Zone Of The Client Computer
      • Globally Install A Package With Yarn
      • Immutable Remove With The Spread Operator
      • Initialize A New JavaScript Project With Yarn
      • Install The Latest Version Of Node With Nvm
      • Interpolate A String Into A Regex
      • ISO-8601 Formatted Dates Are Interpreted As UTC
      • Link A JavaScript Package Locally
      • List Top-Level NPM Dependencies
      • Make The Browser Editable With Design Mode
      • Matching A Computed Property In Function Args
      • Matching Multiple Values In A Switch Statement
      • Mock A Function With Return Values Using Jest
      • New Dates Can Take Out Of Bounds Values
      • Numbers Are Empty
      • Object Initialization With Shorthand Property Names
      • Obtain Undefined Value With The Void Operator
      • Parse A Date From A Timestamp
      • Random Cannot Be Seeded
      • Reach Into An Object For Nested Data With Get
      • Render An Array Of Elements With React 16
      • Resolve And Pass Multiple Values From A Then
      • Running ES6 Specs With Mocha
      • Scoping Variables With A Block Statement
      • Sleep For A Bit In Async Code
      • Sorting Arrays Of Objects With Lodash
      • Splat Arguments To A Function
      • Spread The Rest With ES6
      • Start Node Process In Specific Timezone
      • String Interpolation With Template Literals
      • Support Nested Matching In Custom Jest Matchers
      • Tell Prettier To Not Format A Statement
      • Test Coverage Stats With Jest
      • Test Timing-Based Code With Jest Fake Timers
      • The Comma Operator
      • Throttling A Function Call
      • Timing Processes
      • Transforming ES6 and JSX With Babel 6
      • Truthiness of Integer Arrays
      • Turn An HTMLCollection Into An Array
      • Turn Off Console Error Messages In A Test
      • Waiting On Multiple Promises
      • Who Am I: NPM Edition
      • Yarn Commands Without The Emojis
      • Yup Schemas Are Validated Asynchronously
    • ml
      • reasonML
        • Break Out Of A While Loop
        • Compile Reason To Native With Dune
        • Compile Reason With An OCaml Package Using Dune
        • Create A Map Of Strings
        • Create A Stream From An Array
        • Creating A 2D Array
        • Data Structures With Self-Referential Types
        • Defining Variants With Constructor Arguments
        • Dynamically Create A Printf String Format
        • Exhaustive Pattern Matching Of List Variants
        • Format The Current File Within Vim
        • Generate A Native ReasonML Project With Pesy
        • Generate Starter Reason Projects
        • Helping The Compiler Help Us With Variants
        • Inline Component Styles With Reason React
        • Is This A Directory Or A File?
        • Making Things Mutable
        • Modifying A String With blit_string
        • Multi-Argument Functions As Syntactic Sugar
        • Pattern Match On Exceptions
        • Quickly Bootstrap A React App Using Reason
        • Seeding And Generating Random Integers
        • Stream A File Line By Line
        • String Interpolation With Integers And Sprintf
        • String Interpolation With Quoted Strings
        • Trying Out ReasonML In CodeSandbox
        • Two Ways To Find An Item In A List
        • Using Optional Labeled Function Arguments
        • Wrapping A Component For Use In JavaScript
    • node
      • asdf
        • Fix Unlinked Node Binaries With asdf
        • Interactively Browse Available Node Versions
        • Set The asdf Package Version For A Single Shell
        • Update Package Versions Known By asdf Plugin
    • php
    • python
      • Access Instance Variables
      • Create A Dummy DataFrame In Pandas
      • Test A Function With Pytest
    • rails
      • Add A Check Constraint To A Table
      • Add A Foreign Key Reference To A Table
      • Add A Reference Column With An Index
      • Add ActiveRecord Error Not Tied To Any Attribute
      • Add React With Webpacker To A New Rails App
      • Add timestamptz Columns With The Migration DSL
      • Access Secrets In A Rails 5.2 App
      • ActiveRecord Query For This Or That
      • Advance The Date
      • Allow List Params Anywhere With Strong Params
      • All or Nothing Database Transactions
      • Assert Two Arrays Have The Same Items With RSpec
      • Attach A File With Capybara
      • Attribute Getter without the Recursion
      • Attribute Was
      • Autosave False On ActiveRecord Associations
      • Bind Parameters To ActiveRecord SQL Query
      • Build A Hash Of Model Attributes
      • Capture Development Emails With Mailhog
      • Capybara Page Status Code
      • Cast Common Boolean-Like Values To Booleans
      • Change The Nullability Of A Column
      • Change The Time Zone Offset Of A DateTime Object
      • Check If ActiveRecord Update Fails
      • Check If Any Records Have A Null Value
      • Check Specific Attributes On ActiveRecord Array
      • Code Statistics For An Application
      • Columns With Default Values Are Nil On Create
      • Comparing DateTimes Down To Second Precision
      • Conditional Class Selectors in Haml
      • Convert A Symbol To A Constant
      • Count The Number Of Records By Attribute
      • Create A Custom Named References Column
      • Create A Join Table With The Migration DSL
      • Creating Records of Has_One Associations
      • Custom Validation Message
      • Customize Paths And Helpers For Devise Routes
      • Customize The Path Of A Resource Route
      • Delete Paranoid Records
      • Demodulize A Class Name
      • Different Ways To Add A Foreign Key Reference
      • Disambiguate Where In A Joined Relation
      • Ensure Migrations Use The Latest Schema
      • Find Or Create A Record With FactoryBot
      • Force All Users To Sign Out
      • Generating And Executing SQL
      • Get An Array Of Values From The Database
      • Get An Empty ActiveRecord Relation
      • Get The Column Names For A Model
      • Get The Current Time
      • Grab A Random Record From The Database
      • Handle Named Arguments In A Rake Task
      • Hash Slicing
      • Ignore Poltergeist JavaScript Errors
      • Include Devise Helpers In Your Controller Tests
      • Inspect Previous Changes To ActiveRecord Object
      • Link To The Current Page With Query Params
      • List All Installable Rails Versions
      • List The Enqueued Jobs
      • Load Records In Batches With find_each
      • Log SQL Queries Executed By ActiveRecord
      • Mark A Migration As Irreversible
      • Make ActionMailer Synchronous In Test
      • Manually Run A Migration From Rails Console
      • Mark For Destruction
      • Mask An ActiveRecord Attribute
      • Merge A Scope Into An ActiveRecord Query
      • Migrating Up Down Up
      • Order Matters For rescue_from Blocks
      • Params Includes Submission Button Info
      • Parse Query Params From A URL
      • Perform SQL Explain With ActiveRecord
      • Polymorphic Path Helpers
      • Pretend Generations
      • Prevent Writes With A Sandboxed Rails Console
      • Query A Single Value From The Database
      • Read In Environment-Specific Config Values
      • Read-Only Models
      • Remove The Default Value On A Column
      • Render An Alternative ActionMailer Template
      • Render The Response Body In Controller Specs
      • Replace An Index With A Unique Index
      • Rescue From
      • Rescue From With A Separate Method
      • Retrieve An Object If It Exists
      • Rollback A Specific Migration Out Of Order
      • Rounding Numbers With Precision
      • Schedule Sidekiq Jobs Out Into The Future
      • Secure Passwords With Rails And Bcrypt
      • Select A Select By Selector
      • Select Value For SQL Counts
      • Serialize With fast_jsonapi In A Rails App
      • Set A Timestamp Field To The Current Time
      • Set default_url_options For Entire Application
      • Set Schema Search Path
      • Set Statement Timeout For All Postgres Connections
      • Set The Default Development Port
      • Show Pending Migrations
      • Show Rails Models With Pry
      • Show Rails Routes With Pry
      • Skip Validations When Creating A Record
      • Specify New Attributes For #find_or_create_by
      • Temporarily Disable strong_params
      • Test If An Instance Variable Was Assigned
      • Test If deliver_later Is Called For A Mailer
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    • react
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  1. os
  2. linux
  3. ssh

SSH Escape Sequences

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In , I talked about an escape sequence for breaking out of an SSH session when the pipe has been broken. This isn't the only SSH escape sequence though. To see the others, hit <Enter>~?. This displays a help list with all the other escape sequences.

> ~?
Supported escape sequences:
 ~.   - terminate connection (and any multiplexed sessions)
 ~B   - send a BREAK to the remote system
 ~C   - open a command line
 ~R   - request rekey
 ~V/v - decrease/increase verbosity (LogLevel)
 ~^Z  - suspend ssh
 ~#   - list forwarded connections
 ~&   - background ssh (when waiting for connections to terminate)
 ~?   - this message
 ~~   - send the escape character by typing it twice
(Note that escapes are only recognized immediately after newline.)

h/t Josh Davey

💻
🐧
Killing A Frozen SSH Session