How to get website average latency in BASH
I was working on a project today and wanted to be able to get the average latency for an API that I was working on. Performance is a concern because we’re running the API over a VPN, and then SSH tunneling over to another server. I wanted a quick way to do it and wrote a little bash function that will calculate the average for me. I couldn’t find an example on how to do this online so I’m sharing in case anyone else runs into the same issue.
This is tested on Mac only. Add these two functions to your .bashrc and do a shellupdate in terminal to load the latest, or just grab my dotfiles from my github: https://github.com/gregvarghese/dotfiles
curlb(){
curl -s -o /dev/null -w '%{time_starttransfer}\n' "$@"
}
# Usage:
# latencyavg [# of times to run] [URL]
function latencyavg()
{
time=0.00
for (( c=1; c<=$1; c++ ))
do
num1=$(curlb $2 -H 'Accept-Encoding: gzip, deflate, sdch' -H 'Accept-Language: en-US,en;q=0.8,ja;q=0.6' -H 'Upgrade-Insecure-Requests: 1' -H 'User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/50.0.2661.86 Safari/537.36' -H 'Connection: keep-alive' --compressed)
echo "$c - $num1"
time=$(echo "$time + $num1" | bc -l)
done
echo "Total Time $time"
echo $(echo $time / $1 | bc -l)
}Usage example:
latencyavg 20 https://www.godaddy.comHow to fix npm WARN checkPermissions Missing write access to /usr/local/lib/node_modules
A friend was running into an error when using node to install a package. When installing the package he was getting the error “npm WARN checkPermissions Missing write access to /usr/local/lib/node_modules”. The fix turned out to be pretty simple and he just needed to take ownership of the node_modules folder.
Open terminal and run this simple snippet to fix the problem:
sudo chown -R $(whoami) /usr/local/lib/node_modules/How to remove wrapping tags in PHP Storm
How often do you code something and need to delete a wrapping link or div? I was using PHPStorm and had grabbed some code from another file that had links in the tags which weren’t needed in the new file. I didn’t want to manually remove each link and after a quick look around PHPStorm’s menus, discovered that PHPStorm has a really useful command to remove the wrapping element for you.
Select the element, then from the menu, choose Code > Unwrap/Remove… or use the keyboard shortcut, Command + Shift + Backspace and then choose the appropriate wrapping element to remove.
How to Prevent Raspberry Pi Zero from Blanking or Sleeping
I was setting up a Raspberry Pi Zero in an office to use for displaying a slide show of pictures on a TV in the waiting room and dismayed to learn it would constantly go to sleep after a few minutes. I researched and tried setting the consoleblank=0 in config.txt with no luck along many other solutions, but learned none of them worked for the Raspberry Pi Zero.
sudo apt-get update && sudo apt-get install xscreensaverI’m not sure why, but I got an error that some dependencies were not installed. If that happens to you as well, run this command in terminal:
sudo apt-get --fix-missingand then run the install for xscreensaver again
sudo apt-get install xscreensaverNow under Preferences, you’ll see a new option for screen saver:
On the Display Modes tab, you’ll see a drop down for Mode. Choose “Disable Screen Saver”:
Your raspberry pi zero will now no longer go to sleep.
How to fix VMWare Fusion Pro 10 “Cannot find a valid peer process to connect to”
I recently got a new mac and was migrating a VMWare Windows Virtual Machine from my other computer. When starting the virtual machine, I received a random message from VMWare Fusion saying “Cannot find a valid peer process to connect to.”
The fix was rather simple as it was just Apple blocking VMWare from running. To fix it, follow these steps:
- Open System Preferences by searching in Spotlight or clicking the gear icon in the dock.
- On the top row there is an icon for Security and Privacy – Click that icon
- Near the bottom of the screen that appears the following statement
“System software from developer “VMWare, Inc.” was blocked from loading” - Click Allow
Windows 7 & 10 How to Bulk Unblock Blocked Files
While setting up a new computer, Windows was throwing up warnings that files transferred from a backup drive might be unsafe. The files were text and images, so the warnings were safe to ignore but the directory had over one thousand files. Rather than unblocking each file manually, Windows PowerShell makes it easy to unblock files in bulk.
Load up Windows Powershell:
- Press Win + R on the keyboard to open the Run dialog.
- In the Run box, type powershell
For one folder without subdirectories, this snippet will do the trick.“$env:userprofile\Downloads“ tells PowerShell to use the Download folder for the logged in user and unblocks all files in it. Change this to the folder path you need if it’s not the Downloads folder.
get-childitem “$env:userprofile\Downloads“ | unblock-file
If you have sub-directories and need to unblock everything, use the -Recurse flag:
dir “$env:userprofile\Downloads“ -Recurse | Unblock-File
Want to see a report of files to be unblocked before running it? The -WhatIf flag will show you without executing.
dir “$env:userprofile\Downloads“ -Recurse | Unblock-File -WhatIf
How to automatically install gulp dependencies
I created a website where I’m using gulp to create a minified version and had to switch to another computer. For whatever reason, gulp install wouldn’t install the dependencies automatically, even when using the “npm-install-missing” plugin.
Add this script to the beginning of your gulpfile.js before the requirements, and when you run gulp, it will install the dependencies automatically. Be aware you’ll need to rerun your gulp command after the script completes.
(function(){
var r=require;
require=function (n){
try{
return r(n)
}
catch(e){
r('child_process').exec('npm i ' + n,function (err,body){
try{
console.log('Module "' +n + '"" not found, installing.\n' + body )
return r(n);
}
catch(e){
}
})
}
}
console.log('""Please re-run gulp.\n' + body )
})()
Chrome Anchor Link Not Working Fix
One of my single page sites that had been live for months with no changes suddenly had the menu stop functioning in Chrome only. I can’t find an exact reason for the break, but I did find a cross-browser JavaScript solve that fixes the issue nicely. Just add the snippet to your site and the links should work automatically. Note that this fix requires jQuery but can be converted to VanillaJS.
/* Navigation Fix
-----------------------------------------------------*/
$(function() {
$('a[href*="#"]:not([href="#"])').click(function() {
if (location.pathname.replace(/^\//,'') == this.pathname.replace(/^\//,'') && location.hostname == this.hostname) {
var target = $(this.hash);
target = target.length ? target : $('[name=' + this.hash.slice(1) +']');
if (target.length) {
$('html, body').animate({
scrollTop: target.offset().top
}, 1000);
return false;
}
}
});
});
Someone reached out to me today for help as the fix broke their WordPress site. If you’re using WordPress, this version uses the compatibility version of jQuery they provide out of the box. Be sure to place it in a javascript file and not your functions.php. Rui was kind enough to confirm the fix also works for Drupal 7.
/* WordPress Navigation Fix
-----------------------------------------------------*/
jQuery(function ($) {
$('a[href*="#"]:not([href="#"])').click(function() {
if (location.pathname.replace(/^\//,'') == this.pathname.replace(/^\//,'') && location.hostname == this.hostname) {
var target = $(this.hash);
target = target.length ? target : $('[name=' + this.hash.slice(1) +']');
if (target.length) {
$('html, body').animate({
scrollTop: target.offset().top
}, 1000);
return false;
}
}
});
});
How to use Teensyduino to send cmd + enter
Recently we purchased a bunch of Teensyduino powered buttons for a trivia game we were building for a client’s convention as a fun learning experience. Now that the conference is through, the buttons are sitting unused, and my boss asked me if I could reprogram one of them so he could use it to send emails through Outlook on Mac.
It was a fun little exercise since I’ve never worked with programming Teensyduinos before. It turned out that this wasn’t so complicated to accomplish. I figured I’d share the script in case anyone else would find it useful.
int key1 = KEY_ENTER;
int spacesAllowed = 1;
void setup() {
Serial.begin(9600);
pinMode(10, INPUT);
digitalWrite(10, HIGH); // C7
}
void loop() {
if (digitalRead(10) == LOW && spacesAllowed > 0){
Keyboard.set_modifier(MODIFIERKEY_GUI);
Keyboard.set_key1(key1);
Keyboard.send_now();
delay(5);
spacesAllowed = 0; // no spaces allowed anymore
}
if (digitalRead(10) == HIGH){
Keyboard.set_modifier(0);
Keyboard.set_key1(0);
Keyboard.send_now();
delay(5);
spacesAllowed = 1; // button is up again
}
}
If you need to send through Outlook on Windows, change the line
Keyboard.set_modifier(MODIFIERKEY_GUI);
to
Keyboard.set_modifier(MODIFIERKEY_CTRL);
List of my must-have Alfred Workflows
Use a mac? You’ll want to grab Alfred App. I’m finding it an invaluable replacement for spotlight and the workflows allow me to supercharge my workflows. It’s so useful that I’ve purchased the Powerpack lifetime license.
In addition to the standard features, here are a list of the most useful workflows for dev/tech:
Kill process – by Nathan Greenstein (@ngreenstein)
I use it as an activity monitor for CPU usage, and from there I can easily force quit any process if needed. It’s easier to see all processes on the Alfred UI instead of opening Activity Monitor on your mac. There’s also the workflow Kill Application – by Sebastian Hallum Clarke (and also on his site you can find other cool workflows).
Timer – by Daniel Bader
I use this one a lot. It’s super simple and by writing “Timer” and the number of minutes, you can easily set a reminder. It’s great for anyone using the Pomodoro technique or even if you leave something on the stove and want to go back to work.
Copy SSH Public Key – By oldcai
This one saves me time when I need to deploy my SSH key on a new server. Type ‘pk [ssh key file name]’ and it’ll copy the ssh key to the clipboard.
Incognito – by Nedwood
I find myself using this when I need to test a page and bypass the cache. Type ‘incog [url]’ and it’ll launch a new chrome window in incognito mode.
Find Folder by Samvlu
Finds a folder by name. I find this is faster than spotlight in just about every search.
Smart Folders by Deanishe
List all the Smart Folders/Saved Searches (same thing) on your system and drill down into their contents. Works in much the same way as Alfred’s File Filter, but Smart Folders are also available outside Alfred and are a bit more flexible.
For example, you can configure a Smart Folder to show all video/audio/image files without having to specify each different filetype individually. If you already use Smart Folders, this workflow can save you the work of re-implementing them as File Filters.
What’s more, you can exclude specific filetypes with a Smart Folder, which Alfred cannot do.
Advanced Google Maps Search by stuartcryan
This workflow gives you some quick and dirty shortcuts into Google Maps:
Commands:
To Configure:
mapsethome <home address including street number, name, postcode> (i.e. what you would type into Google Maps)
mapsetwork <work address including street number, name, postcode> (i.e. what you would type into Google Maps)
Commands for Use:
maps <query> – Search Google maps for an address
dir <query> to <query> to <query> etc (seperate multiple addresses with ” to ” minus the quotes, and you will get a multiple location search)
dirfw Show directions from Work to address
dirfh Show directions from Home to address
dirtw <query> Show directions from query to Work address
dirth <query> Show directions from query to Home address
trafficw – Show traffic from Home to Work
traffich – Show traffic from Work to Home
StackOverflow Search by deanishe
If you use stackoverflow as much as I do, this is a must-have.
Date Calculator
I find myself needing to calculate differences between dates in my personal life a lot lately. This workflow saves me a lot of time to do that. Want to know how far Christmas is away in days? ‘dcalc 12-25-16 – now d’ returns the number of days (assuming you’re using the US short format like I am).
Wifi Control by miroman
All my Macbooks periodically have issues with wifi. I’ve never been able to figure out what’s causing it but I use Wifi Control to restart the wifi which allows me to connect successfully.
Bugnot by vitor
If you use bugmenot at all, this is a useful extension to get logins without loading a new tab. Type ‘bn domain.com’ and you’ll get a list of matching passwords to use.