TIL by Category • Ryan Greenberg

Apps

WhatsApp has per-conversation member tags(Jun 15)

Chrome

cmd + 9 to select last tab(Jun 19)
Take a full-page browser screenshot(May 12)

Git

git checkout - for last branch(Jun 10)
Find my own commits(May 19)

iOS

Use "Invisible Ink" for spoilers in iMessage(May 19)

Javascript

Number.MAX_SAFE_INTEGER is 2**53 - 1(Jul 3)

macOS

Show the application switcher on all screens(Aug 20)
Spotlight can do math and unit conversions(Jul 30)
cmd + shift + G to Go To Folder(Jul 21)
cmd + option + L to navigate to Downloads(Jun 22)
cmd + tab has a bunch of extras(Jun 12)
Use open to open in other applications(Jun 3)
cmd + shift + 5 is the final screenshot command(May 22)

Misc

Mojibake(Aug 3)
badssl.com lets you test bad certificates(Jul 17)
8b/10b encoding(Jun 29)

Ruby

Pathname for file operations(Jul 1)

Shell

pkill to stop a process by name(Jul 27)
Use process substitution to tag stdout and stderr(Jun 24)
Change the timezone for a command with TZ(Jun 17)
tee to see output and save it(Jun 1)

SQL

box, qbox modes for sqlite3(Jun 8)
Window functions(May 25)

Text

Find shared lines with comm(Jul 14)
Reorder columns, print the last with awk(Jul 9)
Pretty-print column-based data with column -t(May 30)

Tools

Control less options globally with LESS(Aug 17)
less lets you toggle startup flags interactively(Aug 10)
brew bundle and Homebrew Casks replaced my bespoke scripts(Jun 26)
cal for a command-line calendar(Jun 5)
termgraph for CLI charts(May 16)
oxipng and pngquant to compress PNGs(May 14)
tldr for simpler, example-driven help(May 13)

TypeScript

Table names and indexed access types(May 29)