What do you Google EVERY. SINGLE. TIME. and never just memorize?

ben profile image Ben Halpern ・1 min read


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How to properly write a Rails migration file.

Add a column? Huh? What???


Oh yeah. I always copy and paste from old files.



rails g migration AddStuffToTableName new_column1:integer new_column2:text #etc. etc.
  • Converting Array<->List in Java*. Been coding Java for 6+ years and still don't care to learn/memorize this.
  • Objective-C block syntax

  • bash test format and flags

  • vim macro create and execute

I noticed I could never remember these, so I always make aliases, shell functions, or short ~/bin/ scripts for them instead:

  • tar: xkcd.com/1168/

  • netstat flags (other than "-tulpn" which I have memorized as "tull-pin" like "Tolkien")

  • ssh tunnel syntax

Edit: *in one-line.
Array to list:

String[] array = ...;
List<String> immutableList = Arrays.asList(array);
List<String> mutableList = new ArrayList<String>(Arrays.asList(array));

List to array:

List<String> list = ...;
String[] array = list.toArray(new String[list.size()]);

Clear as mud...


Helpful protip. I learned yesterday, that list.toArray(new String[0]) is faster than the version with the explicit size given.


I was about to write the same thing. How to vertically align elements... without using flex 😂


Regex. While I understand how it works and how it can be used, it's difficult for me to memorize the right regex that should be used at every point. So I just google whenever I want to make use of it. :)


Oh yeah that's a big one


I was just like that... but then I've found regex101.com/ and now, I'm almost proficiente writing regex!


regex101 is the single best resource I've ever found for regex.


It's funny in my case. I know enough regex to get by, but I generally need to google to find out how to actually apply it.

Do I need RegExp.prototype.test or String.prototype.match in JS? What are the order of parameters in preg_match in PHP? What are the little parentheses things called in .NET, captures or groups?


I had the same problem, until I found Rubular:


Bonus tip: making a permalink will also save all the test cases used. Makes for an excellent inline comment!


Same here...
BTW, I knew someone must've been written about regular expressions when I read the title.. 😂


I can never remember how it works either. I found this to be helpful, though! regexr.com/


Same here. I can only remember $,,*,+ and /s /w. I always end up up googling an example and going from there.


I always have to Google regex. Or copied old code.


For me it's "manually start postgresql"

Every once in a while my postgres server isn't running and I know to punch that into my browser and land on this Stack Overflow question, where I proceed to copy this command into my terminal:

pg_ctl -D /usr/local/var/postgres -l /usr/local/var/postgres/server.log start

It happens infrequently enough that I never bother to alias it or remember how to type it out. I just remember what to Google.


I have postgres installed via homebrew. So I use brew info postgres to copy the start command :)


So did I then I realize how many precious minutes of my life I'm losing so I decided to buy a domain for 75 cents mycodesnippets.space :) I write things down little by little as soon as I need it the first time or I risk to never do it by lazyness !


I was gonna say this. Have bookmarked the stackoverflow post on this. :D


cant you just sudo service postgresql start ? :P


On Linux, yes. On OSX, no unfortunately.


I could never remember "rails new myapp --database=postgresql" :|


Oh yes, I even googled and used this today because my service keeps stopping.


sed and awk and how to use them.


How to make a tar file...


at least extracting is easy (say it in a german accent) tar -xzf "xtract ze files"


and -czf == 'compress ze files'


well what works for me is tar -xzvf "xtract ze vucking files"
No kidding that's how remember it

this...is actually brilliant! lol


That's a great way! Jajajaaj

But it's important to note that tar is smart enough to detect the format so I prefer the general tar -vxf


Even though as a German with decent English pronunciation this is a little bit insulting, I'll probably never forget this ever again. Thanks! 🙈


Isn't that for zipped tar files? -xzf = extract zipped (tar) file.


I threw this one at a dev I used to work with. He answered instantly, he could have disarmed 2 bombs with that speed.

Instant respect gained


I figured out how to remember it. To create tar, use c option and for extracting replace c with x ==> $tar will remain same for both Lol :) . tar -cvf filename.tar file/dir_path && tar -xvf filename.tar.


Hey, I also want to make a tar file for my website name:Lenny face. Let me know if the given suggestions works for you!

  • Creating SSH Keys

I just ssh-k ↑ in zsh and just list all previous key generation commands or if I am not sure what I am looking for I use fzf

# fh - repeat history
fh() {
  print -z $( ([ -n "$ZSH_NAME" ] && fc -l 1 || history) | fzf +s --tac | sed 's/ *[0-9]* *//')

I was helping someone with this earlier this year. Ended up creating a helper for it:



Suprised tldr didn't got mentioned.

It's a pretty neat tool to do this kind of things...


Best link I've seen all week. Heroic!!!!!


That's awesome! thanks


Javascript array methods. Is this one in-place, or returning a new array? I don't know, but MDN does!


And centering things. Completely clueless every time.


here's a handy multiple choice questionnaire!


holy crap, whoever made this site needs a medal. Great recommendation!!!


How to extract tar.gz file in Linux command line!


Saw a comment from above and it changed my life.

tar -xzf filename xzf = "Xtract Ze Files!" (german accent)


Excellent, noté that you may get ride of the dash.


tar -xf filename

Read as tar eXtract File filename.
Saw this on an SO answer and never had to google it ever again :)


Wow, I never thought of it.

Thanks :)


Everything git related


Yeah. For some reason I really find some git procedures harder to memorise than others. It's ludicrous the number of times I've googled "git unadd a file" and "git reset branch to remote"


How to delete a remote branch in git.


Oh boy, this gets me every. Single. Time.


Cherry picking commits in git, because I can never remember if it's cherrypick or cherry-pick

A more efficient way would be to just do it and correct if it errors, or alias it to git cherry or something

Also, how to exit vim, and how to insert in vim, and basically how on Earth did I end up in vim omg get me out


I've been using Vim now for about 24 years. Primarily because I don't know how to quit.


I would be responsible for 95% of hits coming from google search into the Tutorialpoint's html5 minimal template. Now I could easily type it in every time I set up a new page, but it is now a matter of extreme laziness I think.


How to "unignore" files with git... Here is a nice and short way.


This is stupid but g++ compiling filename and output order in the terminal. I've been doing it for four years now and still failing to remember.


The same with me!! But I found VerbalExpressions (github.com/VerbalExpressions) to have solved it for me.


That is very good to know about.


I usually just go to regexr.com and trial-and-error the syntax until it matches what I want.


Regex kills me sometimes.


How to find out which process is listening on a certain point on my mac. I'm often switching between projects, and have a server from another project running on a port that I now need for another server.

And it looks like Heroku's CLI doesn't always stop all processes correctly when you stop it using ctrl+c


You could add a function to your .bashrc to make this easier:

listening() {
    lsof -n -iTCP:$1 | grep LISTEN

Then (after restarting your terminal or typing source ~/.bashrc) type listening 8080 to find out what process is blocking that port.


ln -s [source] [destination] or ln -s [destination] [source] ?
find . -name [...] -exec grep '...' {} \;

And of course sed, awk and more generally shell syntax (if, loops, switch, etc).


I got a good way to remember argument order for ln:
Destination is optional so it must go second.
By default ln creates a link with the name of the source in the current directory.


Oh yeah, linking. Forgot about that one (obviously, since I need to Google it every time lol).


Many moons ago, at one of my first jobs, I got myself in trouble with this. I was editing something in prod without knowing how to save or exit. I was a windows nt guy mostly. So, like one does, I hard-rebooted the server instead of asking for help... After the dust cleared, my boss made me sit at a keyboard for over an hour launching vim and learning how to at least save and exit. :) I have :wq, :q,:q! burned into my muscle memory to this day...


Oh god why did they have the new guy making changes in prod you poor soul


How to spell maintenance.


That's unneccessarrelly, but true.


This! Plus a few other words: convenient, conscience, accommodate. I'm not a native speaker ;).


I don't have to Google the spelling, but I'd say 99% of the time I type "valud". I say it correctly as "val-id" and only mistype because of the QWERTY keyboard layout. This is the only word that I consistently type incorrectly. It's not a speed thing (like "teh"), because it happens when typing slowly as well. I've been typing for a really long time and I'm beginning to think my brain just thinks this is a funny prank.


As a non native english speaker:




Find a file in Linux. I know it involves "find" and "name" but I have to look up the exact syntax each time. (For reference, the sledgehammer version is find . -name testfile.txt from the root of the drive.)


Usually, anything that is outside of my basic Git workflow.


PHP array_push and array_key_exists parameters order.


this alone should tell you you need to use another language ;)


Argument orders in all array functions in PHP for me. That's just horrible. VSCode gives hints though, so that helps. I still have to look up the exact names of functions regularly, though.


How to type this: ¯\_(ツ)_/¯


The best thing they ever added to Slack was the /shrug command.


Ha! Me too. I know to go straight to textfac.es


unzip a tar file especially with that different extensions .xz , .bz etc..

vim commands to cut,copy and paste

regex in python and other python builtins . Can't memorize the whole docs right ?


Updating the list of git remote branches. It doesn't refresh when you sync so it will continue to list remote branches that don't even exist anymore until you manually run the command below. (Which I had to google again to put in this comment.)

git remote update origin --prune


Git, brew, and bundler all have some kind of prune flag so it's starting to stick for me.


easy to remember because it is like dried fruit!


text-overflow: ellipsis


How to flush DNS cache on OSX


I literally added an alias to my ZSH config for this one

alias flushdns='sudo killall -HUP mDNSResponder'


Setting firewall rules with iptables.

  1. I always Google how to create a webpack configuration file.
    • You need to be a 🚀👨‍🔬 to configure it from memory.
  2. Adding a style tag for CSS files 😝.

"How to do x in CSS" where x is anything


MySQL and PHP date formatting. Every time. What’s weekday again?


How to git checkout a remote branch. I’m gonna try it it without googling

git remote add repoFork <url>
git fetch repoFork
git checkout —track repoFork/branch

I hope that’s right I just looked it up again yesterday


flexbox and grid with all their different attributes and values :/


My first choice was "Regex", but it seems you guys beat me to that choice.

So, without a shame I can say that everytime I search "how to insert an element at the end of another with jquery". Frigging append(), man.


What gets me is when I'm switching between languages. Java uses add, Python has append, and Ruby uses push. But then some gem will use add.

This is why I shamelessly use IDEs while everyone I work with uses vim.


How to use grep and find.
Also when I write data = {} in Python, is this a set or a dict?


This can't be a Set

data = {}

It's always a dictionary!
If you want an empty Set use:

data = set()

P.S. it's handy to use the official Python REPL and type type(youvariable) ;)

  • CSS attributes
  • Rails generators
  • ActiveRecord queries
  • Syntax for any function I don't use on a weekly basis

The argument order to the various PHP array functions


The arguments for JavaScript's array.slice method. Every. Damn. Time.


The order of arguments for map/reduce/filter is JS. Was it (index, item) or (acc, index, item) or (item, index)....


SQL syntax #ashamed.


Vim commands.

Just...I can't even.


ever play:



bonus tip: a lot of unix commands support vim keys by default. i.e. less and man


When I accidentally commit on master instead of a branch and I need to reset my master to match origin:

git reset --hard origin/master


Everything! 🤪
But seriously, I think I do a lot of Googling (and looking at Documentation - same thing?) for things which are new or I'm uncertain of or if I'm working with an SDK like Firebase.
Is that the way I'm supposed to do it? 😂 I'd rather get things right first time rather than get it wrong and THEN Google. Sounds like the other things people Google are a lot more advanced. 😳