Bits — garron.me

Quick technical notes, one-liners, and short posts on Linux, DevOps, and open source tools.

Show Docker container logs — July 20, 2020
How to check Docker compose logs from the host
How to use awk to print text string between characters — June 14, 2020
How to print a specific string of text that is between specific characters
build-essential in Arch Linux — March 31, 2020
What is the equivalent to build-essential in Arch Linux
How to upgrade CentOS to 8.1 — February 29, 2020
How to upgrade to CentOS 8.1
How to upgrade Middleman to the latest stable version — February 23, 2020
How to upgrade Middleman to the latest stable version on Ubuntu
How to edit files with Notepad++ on WSL Linux — February 23, 2020
How to edit files with Notepad plus on WSL, Ubuntu on Windows 10
How to shutdown or reboot Linux — July 4, 2015
How to reboot or turn off a Linux powered computer, server or workstation, works on laptops too.
Copy Files on Linux and BSD (cp command with examples) — May 30, 2015
How to copy files on Linux or BSD like systems (Mac OS X, FreeBSD) from one location to another on same computer
Change permissions recursively in Linux or BSD — May 29, 2015
How to change permissions to files recursively for Owner, Group and Other the easy way
Nginx send 404 to backend — May 24, 2015
How to redirect all 404 errors to backend on Nginx so an application can take care of those errors
Make MySQL listen on other interfaces — May 18, 2015
How to make MySQL bind all network interfaces and not only localhost, so it can be accessed from the external network
Using apt-cache to search for packages — March 22, 2015
How to search and find packages on Ubuntu or Debian using apt from command line
Optimize jpg and png for your website — March 21, 2015
How to compress and optimize jpeg or jpg and png files for fast loading websites
Make Firefox wrap html pre tags — March 15, 2015
How to make Firefox to wrap PRE html tags
Installed packages on Ubuntu — February 22, 2015
How to list all installed packages in Ubuntu or Debian
How to clean up MySQL — February 22, 2015
How to clean MySQL from unused databases and users
Add options to an installed package in FreeBSD — February 1, 2015
How to compile software from ports in FreeBSD with more option when it was already installed
Install Nginx on FreeBSD — January 14, 2015
How to install Nginx on FreeBSD
Latest version of Jekyll on Ubuntu — January 11, 2015
How to install the lastest version of Jekyll on Ubuntu
MySQL select from where multiple conditions — January 11, 2015
SELECT FROM WHERE in MySQL with multiple conditions
MySQL SELECT FROM range of dates — January 11, 2015
MySQL Select From Range of Dates
VirtualBox Guest Additions for Ubuntu — January 10, 2015
How to install VirtualBox Guest Additions in Ubuntu
Import csv file into MySQL table — January 10, 2015
How to import csv file data into MySQL database
Test Apache and PHP configuration with php info script — January 1, 2015
How to test PHP and Apache server with phpinfo script
Remove M characters with vim — November 29, 2014
“Get rid of M characters of text files with vim"
Insert lines in files with sed — November 29, 2014
Insert lines to files with sed editor
Replace with sed — November 29, 2014
Replace words in files with sed
Hide commands from bash history — September 26, 2014
“How to type commands in shell and prevent them from being logged or recorded on bash history"
Forgot to enter sudo — September 7, 2014
“How to insert sudo in front of commands when you have already run it"
Flush Postfix Queue — September 7, 2014
How to flush the queue of Postfix MTA and free all emails not already sent
Show the Contents of a File in a Unix-like Terminal — September 6, 2014
“How to show the contents of a file under Linux or any other Unix like system like Mac OS X”
Compiling C programs on Linux — September 6, 2014
“How to compile and run programs written in C on Ubuntu or Debian Linux”
List Members of a Group in Linux — September 6, 2014
“How to know the users that belongs to a group in Debian or Ubuntu Linux”
Installing .deb files in Ubuntu and Debian — September 6, 2014
How to install a .deb file in Ubuntu, Debian, Mint or any other Debian-based distribution using apt or dpkg
Changing Password — September 6, 2014
“How to change the password of the current user or another user in Unix like systems. Linux or Mac OS X”
Outlook 2011. Show Full Headers — August 16, 2014
How to show full headers of email in Outlook 2011 on Mac OSX
Wget. Resume, limit rate and run it in background — August 16, 2013
How to run wget in background, limit rate and continue broken or interrupted downloads
Resume interrupted downloads with wget — July 7, 2013
How to resume a broken download, and continue downloading the file from the place it was interrupted
How to limit wget download rate — July 7, 2013
Limit wget download rate, so others can share the bandwidth in your home of office, otherwise wget will use all it can
Solved. 'Warning: Creating default object from empty value in wordpress' — June 30, 2013
Solved PHP, Wordpress error 'Warning: Creating default object from empty value in wordpress'
Backup git bare repository — June 26, 2013
How to backup a bare git repository over ssh on another server automatically and periodically
Recursively count files — June 20, 2013
How to count files recursively in a folder when you are using BSD, Linux or Mac OS X
FreeBSD. Change pkg_add source — June 6, 2013
How to change FreeBSD pkg_add ftp source site, and also the folder where it looks for packages
How to switch to root using su on FreeBSD — June 6, 2013
Switch to root using su when working with FeeBSD, access root account
Environment set and display Freebsd — June 6, 2013
Environment settings on FreeBSD, set and get, display the vealue of a environment variable
Delete spaces from filenames — June 3, 2013
How to delete spaces in filenames in Linux or Mac, actually Unix kind operating systems
Delete or drop MySQL database tables — May 24, 2013
How to delete or drop one or more tables from MySQL database, using mysql interactive shell or command line
Static custom 404 page, Nginx and Apache — May 18, 2013
How to create custom 404 pages for static web sites, for both Nginx and Apache web server
Remove vim and emacs backup files. Endind with hash or tilde ~ — May 18, 2013
Delete files ending with hash or ~ tilde. Vim or Emacs backup files. Here is how to get rid of those files
How to install gsl ruby gem on Ubuntu — May 18, 2013
How to install gsl ruby gem on Ubuntu. gsl gem is needed for example to run jekyll with lsi option, to generate better related posts
PostgreSQL server for Django applications under Ubuntu — May 9, 2013
In case you have a Django application needing a PostgreSQL server, you can use this to install it under Ubuntu server
Invalid command 'Header' .htaccess file — April 29, 2013
Solved. Invalid command 'Header', perhaps misspelled or defined by a module not included in the server configuration
Upgrade Ubuntu over ssh. Using terminal and screen — April 25, 2013
How to upgrade, Ubuntu to a new version using the terminal and ssh connection
How to undo 'git add' command, before commit — April 24, 2013
Undo _git add_ command before commiting the changes
GNU Emacs spell check — April 23, 2013
How to spell check on emacs for Linux or Mac
Resize mp4 video, convert to ogg and upload to HTML 5 site — March 11, 2013
How to prepare a video to be uploaded to an HTML5 compliant site. You need to resize and convert to mp4 and ogg formats
Rename files from uppercase to lowercase in bash — February 15, 2013
Bash. How to rename files from uppercase to lowercase
Imagemagic convert resize and change quality in batch — February 15, 2013
Change quality and resize pictures in batch using imagemagick convert command in Linux or Mac
Search for string recursively in all files and folders — February 12, 2013
How to look for a string recursively in all files using grep command line in bash for Linux or Mac OS X
KVM, QEMU start or stop virtual machine from command line (CLI) — February 11, 2013
How to start or stop a KVM or QEMU virtual machine from the host command line
Ubuntu. Two network interfaces only one for Internet the other for internal use — January 31, 2013
Ubuntu. Configure two network interfaces, one only for Internal resources and the other for Internet
Ubuntu Desktop Gnome Shell or Unity proxy settings — January 31, 2013
How to set up proxy settings in Ubuntu Desktop. Unity or Gnome shell
Linux. Create a file where the file name is the current date — January 30, 2013
How to create a file in Linux where the name or part of it is the current date and hour
Mac OS X, Ubuntu Linux, Network traffic monitor — January 30, 2013
How to measure or monitor the traffic on a eth or wireless LAN interface on a Unix-like OS. Linux or Mac OS X
htaccess file no cache — January 27, 2013
How to forbid or avoid your pages to be cached using htaccess and Apache
Iptables. How to open a port to one ore more specific IP — January 27, 2013
How to open a port to one or more specific IP address using iptables rules
ssh with no password, with ssh-keygen key — January 24, 2013
Log into ssh servers (Mac OS X or Linux) without passwords, using ssh key. How to generate them with ssh-keygen and install on the server
Migrate MySQL database — January 22, 2013
how to migrate a MySQL database to a new server, or between two servers, using scp and mysqldumb
Package libapache2-mod-fastcgi is not available. Ubuntu — January 22, 2013
how to install fastcgi on Ubuntu server when. cant install fastcgi ubuntu server: Package libapache2-mod-fastcgi is not available
Ubuntu Linux: Create swap file — January 22, 2013
How to increase Ubuntu Linux server memory, create and add swap space with swap file
Clone a bootable usb key — January 15, 2013
How to clone a bootable usb key, or copy to disk for storage. Useful to create copies of bootable usb memory
Varnish: Do not cache 404 error pages — January 15, 2013
Stop Varnish cache server from caching 404 error pages. Or make it cache them for only a short period of time
Could not reliably determine the server's fully qualified domain name, using 127.0.1.1 for ServerName — January 10, 2013
How to solve: apache2: Could not reliably determine the server fully qualified domain name, using 127.0.1.1 for ServerName
From Jekyll to Pelican — January 9, 2013
Little tools to help you switch from Jekyll to Pelican. Change YAML Front Matter to Markdown headers
Git on Mac ignoring rename uppercase to lowercase — January 7, 2013
Git on Mac ignoring changes in filenames from uppercase to lowercase due to ignorcase option set to true
How to install GeoIP with CPAN on Ubuntu — January 6, 2013
How to install GeoIP module with CPAN on Ubuntu Linux
Git: Revert uncommitted changes — January 5, 2013
How to revert uncommitted files and folders and anything changed since last commit
Bulk resize images and change its quality with imagemagick on Linux and Mac OS X — January 2, 2013
imagemagick on Linux or Mac, to resize pictures, and change quality, all files in a folder at a time
Rename files to lower case on Linux or Mac — January 2, 2013
How to use bash for loop to rename files from upper case to lower case on Linux or Mac OS X
rsync selectively copy some file type using include exclude options — December 31, 2012
How to use rsync to copy only certain file type, using include and exclude options
Ubuntu: Disable daemon on startup — December 29, 2012
How to disable a daemon from starting at boot time on Ubuntu Linux
Apache htaccess: Add Cache-Control header per file type — December 29, 2012
How to add Cache-Control header on a per file type basis
What version of CentOS am I running — December 27, 2012
What version of CentOS am I running
How to install htop on CentOS — December 27, 2012
How to install htop on CentOS server
Let Wordpress users install plugins and themes without FTP credentials — December 27, 2012
How to install Wordpress plugins and themes without FTP credentials
mkdir: create multiple directories in one command — December 27, 2012
How to create multiple directories with mkdir in one liner command
Enable mod headers module on Apache 2 — December 23, 2012
How to enable mod headers module on Apache2
Enable mod rewrite module on Apache 2 — December 23, 2012
How to enable mod rewrite module on Apache2
rsync exclude files or folders — December 23, 2012
How to exclude file or files or folders when using rsync
301 htaccess redirect — December 23, 2012
301 http redirect using Apache htaccess file
gzip encoding with curl — December 23, 2012
How to enable gzip encoding with curl to check Nginx or Apache compression"
gzip files and keep original file — December 23, 2012
How to gzip files and keep the original one
How to flush or clear varnish cache — December 20, 2012
How to flush or clear the reverse proxy varnish cache from command line on Linux
Search and replace in lots of files with find and sed — December 5, 2012
Bash one-liner replace string in lots of files. Linux and Mac
Install Middleman blog on Ubuntu — December 5, 2012
How to install middleman on Ubuntu
Installing Jekyll on Ubuntu — December 5, 2012
How to install Jekyll on Ubuntu
How to install Google Chrome on Ubuntu — November 30, 2012
How to install Google Chrome on Ubuntu
Installing Nvidia Drivers on Ubuntu Linux — November 30, 2012
How to install Nvidia drivers on Ubuntu Linux
How to use useradd to create and administer users under Linux — November 29, 2012
How create and administer users on Ubuntu Linux with useradd command
Set auto or manually installed flag for packages in Ubuntu or Debian — November 28, 2012
How to set or unset manually/auto installed flag on Ubuntu or Debian Linux
Could not be synced because the sync session failed to start | iTunes — November 24, 2012
How to solve the -could not be synced because the sync session failed to start- problem with iPod, iPhone or iPad
Delete all files of a given type in a folder structure in Bash, recursively — November 22, 2012
Linux, Unix, Mac OS X: Delete all files of a given type in a folder structure, recursively
Delete all files in a folder structure in Bash — November 21, 2012
Linux, Unix, Mac OS X: Delete all files from a directory structure
Install a Debian package (.deb file) from command line — November 20, 2012
How to install a .deb (Debian package) from the command line
Debian and Ubuntu development tools installation, make gcc and others — August 9, 2012
How to install Debian development tools, so you can develop and compile software on Debian Linux
Ruby Juicer: Combine / Merge and minify CSS files — July 22, 2012
Learning how to use ruby juicer, to merge and combine CSS files, while at the same time minify them, using yui-compressor
md5sum on Mac OS X | check MD5 hashes — July 13, 2012
How to calculate MD5 hash of a file with Mac OS X | md5sum equivalent for Mac
vim tip: How to undo and redo changes — July 13, 2012
How to undo changes in vim, and how to redo them too
Check the physical status of an ethernet port in Linux — July 11, 2012
How to check from the command line the physical status of an ethernet port in Linux, or most people know it these days, Ubuntu
perl pie: substitute or change text string in lots of files from the terminal — July 3, 2012
Small tutorial to teach you how to use perl pie, or actually perl -pi -e to substitute a string in lots of files at the same time. All from the command line of your Mac or Linux
Use wget to download links in a file | A file with a list of links — July 2, 2012
Download a list of links in a file from a file using the terminal and wget
Create a new database and user, and set privileges to the user | Using MySQL console-terminal — June 24, 2012
Create a new database and a new user on MySQL and set privileges and rights to the user over the newly created database - Using the terminal
Safari open link in new tab — June 20, 2012
How to change default behavior in Safari web browser; to open link in new tab instead of new window
Recover MySQL root password — June 10, 2012
How to recover MySQL root password using the terminal
Apache: You don't have permission to access the requested directory — June 10, 2012
Solve Apache error: You don't have permission to access the requested directory
Find the process ID (PID) of a given program, using ps or pidof — June 8, 2012
Find the process ID or PID of a given program on Linux, Mac OS X or another Unix based OS
Pause or Stop iPhoto's PhotoStream sync with iCloud — June 4, 2012
How to stop or pause iPhoto PhotoStream sync with iCloud
Use wget with a proxy server. How to configure — May 31, 2012
How to configure wget to use proxy with and with out password
Mac OS X or Linux | get http headers of an url from the terminal using curl — May 27, 2012
Check http headers on Mac OS X or Linux terminal, using curl
Test grammar on Mac | TextEdit grammar check — May 27, 2012
Enable grammar test on TextEdit app on Mac
start, stop or restart Apache from the console terminal in Mac OS X — May 27, 2012
How to start, stop or restart Apache in Mac OS X from the console terminal
Send a DELETE request using curl command — May 27, 2012
Send a DELETE request using curl | Linux or Mac
Shut down (turn off) a Mac remotely via ssh — May 27, 2012
How to turn off (shut down Mac remotely via ssh using the terminal
http post with command line curl — May 26, 2012
How to send http post with curl command line
Solved: Installing pg gem in Arch Linux libpq-fe.h — May 25, 2012
Solved: checking for libpq-fe.h... no Can't find the 'libpq-fe.h header. While installing pg gem on Arch Linux
Find the real path of a file or folder: Use realpath command — May 24, 2012
Find the real path of a file or folder using realpath command
sass minified output — May 22, 2012
sass output minify, using command line with scss file
Convert Open Office odt document to plain text file — May 21, 2012
Convert Open Office or Libre Office odt files to plain text txt files
How to specify nano or vim as editor for crontab file — May 21, 2012
How to specify an editor to open crontab file
Add html extension to uri using htaccess file or Nginx — May 9, 2012
Add .html extension to url in Nginx or Apache using .htaccess
How to find the Xcode version — May 6, 2012
Find the version or Xcode you are running
Copy terminal output to clipboard Mac OS X — May 6, 2012
Mac OSX: Copy terminal output to clipboard
vsftpd error: 500 OOPS: vsftpd: refusing to run with writable root inside chroot () — May 4, 2012
Solved: 500 OOPS: vsftpd: refusing to run with writable root inside chroot ()
Use wget to Recursively Download all Files of a Type, like jpg, mp3, pdf or others — April 29, 2012
Download all files of specific type recursively with wget | music, images, pdf, movies, executables, etc
Find Files Modified Between Given Dates — April 29, 2012
Find a file modified between specific dates from the terminal in Mac OS X or Linux
Slow Internet Speed in Bolivia, Compared with the Rest of the World — April 29, 2012
Test result, internet speed in Bolivia
How to stop cronjob from sending email every time it is executed — April 28, 2012
Stop cronjob emailing you when the job is executed by the cron daemon
File is not within the allowed path — April 27, 2012
Solve PHP proble with basedir, File is not within the allowed path
Set pretty permalinks in Wordpress. Solve 404 error on Nginx — April 27, 2012
How to configure Nginx to work with pretty permalink in Wordpress, 404 error solved
How to kill all instances of Google Chromium in Linux from command line — April 27, 2012
How to kill all child processes of chrome / chromium in Linux from command line
Add a Directory to Path in Bash — April 25, 2012
How to add a directory or folder to path variable in bash
Google Drive vs Dropbox — April 25, 2012
Why I prefer Dropbox over Google Drive
Check if Given Program is Running and Start it if not — April 25, 2012
Bash shell script to check if a given program or command is running, and start it if not already running
Check, Show your IP address in Linux — April 25, 2012
How to check or show your local IP address in Linux
Set IP address on Linux using the ip command — April 25, 2012
How to set, view, and remove IP addresses on Linux using ip addr, and how to make them permanent with Netplan or NetworkManager
Google's Gmail Tap — April 1, 2012
Gmail Tap, a new way to write in your smart phone
Real Hot Summer — March 28, 2012
Last Summer was Really Hot
How to Deal with Down Votes — March 17, 2012
Link to a Good Article About Down Votes, in Reddit or Hacker News
Comparing new iPad screen — March 17, 2012
iPad screen under microscope link
Secure DNS in Chroot — March 15, 2012
Install a Chrooted DNS server
New iPad Review — March 15, 2012
New iPad review
My Interview at Linux Notes from DarkDuck — March 14, 2012
My Interview at Linux Notes from DarkDuck
Enable Web Sharing in Mountain Lion — March 14, 2012
How to enable Apache server in Mountain Lion
Configure Slackware on a MacBook Pro — March 14, 2012
Good link that shows you how to get Slackware on a MacBook Pro configured
Are your Answers to Security Questions Secure? — March 14, 2012
Be sure to make your answers to security questions, "secure"
Link via and Sharing Links — March 13, 2012
Sharing links and using link via
Choosing the Right iPad — March 13, 2012
Which iPad should I buy? Read what Marco recommends
What is Property — March 13, 2012
Defining propertry: by Paul Graham
Angry Birds for Chome — March 13, 2012
Angry Birds now available for Chome, Online or Offline | Enjoy playing it
Finally working Email to Jekyll — March 10, 2012
Mail to Jekyll, finally got it working
Hello World — March 10, 2012
Hello World test from email. This is still not working.
Beagle Dog — March 10, 2012
The Beagle is one of my favorites breed of dogs.
Posting on the go — March 10, 2012
After some months of having this feature on my old Drupal blog, I know have it again in this new blog powered by Jekyll. At least in this section, I do not...
Free writing — March 10, 2012
In this Bits section I plan to have somehow a more free-writing as I'm now going to be able to even post by email to this section, I might be posting about day ...
Linux App Store — March 10, 2012
Synaptic package manager, the Linux App Store
Some Apps from the Mac App Store that Worth Checking Out — March 10, 2012
The Mac App Store is big, maybe not at big as the iOS one, but big anyway. Therefore it is always nice to find some one's list of favorites. If you are a...
Using my blog as Twitter — March 10, 2012
using my blog as Twitter
Jekyllmail.rb Post to Jekyll by email — March 10, 2012
Using Jekyllmail ruby program
Cat Picture — March 10, 2012
A nice cat picture
Why call 4G something that actually is not any better than 3G — March 10, 2012
The Marketing Behind 4G Label
Resizing Images on Fly with Ruby — March 10, 2012
If you ever need to resize an image using Ruby, and you are familiar with Linux command from Imagegick. You may use [RMagic][1] [1]...
Duck Picture — March 9, 2012
Just the picture of a nice duck
Email to Blog Final Testing — March 9, 2012
Hope this time this works, this is one of my last tests, because I need to sleep.
Using vim with crontab -e — March 9, 2012
If you want to use instead of with . You can use this command: export EDITOR=/usr/bin/vim And then invoque You should now be using instead of
Still not Completely Working the Email to Blog implementation — March 9, 2012
I'm still trying to have this working. Actually it works, but not completely automatic, and the whole idea behind sending an email to your blog is that...
Blogging from email — March 9, 2012
This is just a test of a nice feature I'm trying to enable in my blog. Something I miss from [Posterous][1]. And it is the ability to post from email. [1]...
Sending picture to my blog from iPhone — March 9, 2012
Testing the way to send a picture from iPhone to my blog. Using Jekyll and [Masukomi][1]'s script. [1]: http://masukomi.org
Great News About the New iPad Battery — March 9, 2012
The new iPad battery has doubled its battery [read more here][1]. [1]: http://parislemon.com/post/18974719971/the-new-ipad-battery
Good Collection of Graphics Linux Tools — March 9, 2012
Here is a nice review of some good graphics tools or apps as Darckduck is calling them [Check them here][1] [1]...
iPad not a Laptop Replacement — March 2, 2012
iPad or Android Tablets not a Laptop Replacement
Deploying Cloudfront in Front of my Site — February 27, 2012
Deploying and experimenting with Cloudfront for complete site
Steve Jobs was a Genius, Steve Ballmer is not — February 6, 2012
Steve Ballmer laughs at iPhone, he just can't be as smart as Steve Jobs was
Embarrasing: Anonymous Got Access to a Private Conversation Between US and UK Police Departments — February 3, 2012
Anonymous intercepts a conversation between US and UK police
Learning to Hack — February 3, 2012
Full Guide to Become a Hacker
Rose Kennedy Quote — February 2, 2012
Rose Kennedy Quote
Starting a new section in my site "bits" — February 2, 2012
Starting a new section in my site
Understanding the bin, sbin, usr/bin , usr/sbin split — February 2, 2012
Understanding the bin, sbin, usr/bin , usr/sbin split