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Thu, May 11, 2017 10:38 pm

Firefox in Force Quit Applications, but not in Activity Monitor

Firefox stopped responding whenever I attempted to access a site. I could verify network connectivity to various sites with ping, but if I attempted to access a URL in the Firefox browser on my MacBook Pro running OS X El Capitan, Firefox (version 45.7.0) would not display any webpage. I've had this problem in the past; when it occurred, I would quit Firefox, sometimes using Force Quit Applications, which is available by clicking on the Apple icon at the top, left-hand corner of the screen and then selecting Force Quit and then selecting Firefox from the Force Quit Applications list of running applications and then clicking on the Force Quit button. When I did that today, I saw the message below as usual:

Do you want to force "Firefox" to quit?

You will lose any unsaved changes.

 

I clicked on Force Quit, but that seemed to have no effect. I closed and reopened Force Quit Applications and went through the same process numerous times, but no matter how many times I repeated the process, Firefox remained in the list of running applications that it showed.

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Sat, May 06, 2017 10:55 pm

Installing Homebrew on Mac OS X

Homebrew is a free and open-source (FOSS) package management system that is available for OS X/macOS systems. Homebrew makes extensive use of GitHub to expand the support of several packages through user contributions. The software was written by Max Howell in 2009; as of July 2016 there was a team of twelve developers maintaining the software. You can install it by opening a Terminal window and issuing the command /usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)". I recommend putting the sudo command at the beginning of the command, so you won't be prompted so many times to provide the password for your account during the installation, i.e., sudo /usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)".

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Mon, May 01, 2017 11:16 pm

Installing Wireshark on Mac OS X El Capitan

Wireshark is free and open-source software that provides packet capture and analysis capabilities. The software is available for Mac OS X/MacOS systems. An Apple Disk Image .dmg file can be downloaded from Download Wireshark. After downloading the .dmg file, double-click on it to open it. Inside the .dmg file you will see a .pkg file and a Read me first.rtf file.

Wireshark DMG file

Double-click on the .pkg file to start the installation.

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[/os/os-x] permanent link

Fri, Mar 17, 2017 6:19 pm

OS X "arrange by" in column view

I usually have the OS X Finder set to display folders and files in alphabetical order by setting the view mode to arrange the display of files and folder by name. But sometimes I switch to view by size, etc. However, when I then switch back to view the files and folders in column mode arranged by name, Finder doesn't actually display them in alphabetical order, which is annoying.

I finally got to the point where the issue was so annoying that I felt I had to find a solution. I found Brett Taylor's HOWTO: Fix file sorting in Finder‘s column view on Mac OS X Lion article which provided a means to address the issue. Though the title for his article, which acknowledges Barney-15E's post at In OS X Lion, Finder will not "Arrange By > Name" in "Column view", references OS X Lion, I found the solution worked for OS X El Capitan (10.11.6) on my MacBook Pro.

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Sat, Mar 11, 2017 4:53 pm

Losing Internet connectivity via Wi-Fi on an OS X system

On my MacBook Pro laptop running OS X El Capitan (10.11.6), I've been losing Internet connectivity periodically. Though it appears I still have Wi-Fi connectivity, when I attempt to access websites through a browser I find that I can't access sites at times, though a moment before I had no issues browsing the Web. Firefox will display a "Server not found" message. If I go to a Terminal window and try to ping any IP address, I see "request timeout" messages.

$ ping 8.8.8.8
PING 8.8.8.8 (8.8.8.8): 56 data bytes
Request timeout for icmp_seq 0
Request timeout for icmp_seq 1
^C
--- 8.8.8.8 ping statistics ---
3 packets transmitted, 0 packets received, 100.0% packet loss
$

If I check the status of the WiFi connection using the airport command, I see that it is very noisy, though the signal stength is good, which I would expect, since the laptop is only a few feet from the wireless router.

$ /System/Library/PrivateFrameworks/Apple80211.framework/Versions/Current/Resources/airport -I
     agrCtlRSSI: -39
     agrExtRSSI: 0
    agrCtlNoise: -93
    agrExtNoise: 0
          state: running
        op mode: station 
     lastTxRate: 73
        maxRate: 72
lastAssocStatus: 0
    802.11 auth: open
      link auth: wpa2-psk
          BSSID: 94:44:52:4a:43:40
           SSID: Rain
            MCS: 7
        channel: 11
$

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Thu, Feb 09, 2017 10:51 pm

Installing MySQL on OS X El Capitan

The steps below can be taken to install the MySQL relational database management system software on an Apple OS X/macOS system. The steps were taken for MySQL version 5.7.17 on a MacBook Pro laptop running OS X El Capitan, but should be similar, if not exactly the same for other versions of MySQL and on other versions of OS X.

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Mon, Feb 06, 2017 10:59 pm

Using Python scripts with Apache on OS X El Capitan

If you've got the Apache web server software working under OS X El Capitan, but want to use Python scripts with Apache, the following steps will allow you to run Python scripts from a cgi-bin directory.

First, ensure that the hash sign (#) is removed from the LoadModule cgi_module libexec/apache2/mod_cgi.so in /etc/apache2/httpd.conf. If you need to remove the hash/pound sign, restart Apache after modifying the file, which you can do with sudo apachectl restart. You will also need to use the sudo command to edit the file, if you edit it with a text editor such as GNU nano or vi.

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[/os/os-x/apache] permanent link

Sun, Feb 05, 2017 10:51 pm

Using Perl with Apache under OS X El Capitan

If you've got Apache running on your Mac OS X system and want to be able to display the output of Perl programs, you need to remove the hash sign (#) from the following line in /etc/apache2/httpd.conf.

#LoadModule cgi_module libexec/apache2/mod_cgi.so

You will neeed to edit the file with a text editor, such as the TextEdit app found in the Applications directory, or GNU nano or vi. And you will need to run the editor with root, i.e., administrator privileges by using the sudo command in order to be able to save modifications to the file. E.g.:

sudo nano /etc/apache2/httpd.conf

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[/os/os-x/apache] permanent link

Sat, Feb 04, 2017 10:44 pm

PHP for Apache on OS X El Capitan

If you are running an Apache web server under OS X El Capitan and want to use PHP with Apache, you will need to take some additional steps after you've got Apache running on OS X/macOS. Once you've got Apache working on the system, you can create a .php file, e.g. phptest.php and have the page displayed by your browser if you visit the page, but PHP code within the page won't be executed. E.g., suppose the phptest.php page contains the following code:

<!DOCTYPE HTML>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>PHP Test</title>
</head>

<body>

<h2>A test page</h2>

<?php phpinfo(); ?>

</body>
</html>

If I visit the page using a browser, the HyperText Markup Language (HTML) code on the page will be displayed, e.g. the "A test page" heading will be displayed, but the information that the phpinfo() command would display regarding the PHP settings for a system on which PHP is working won't be displayed. You could also try a simple PHP echo command, e.g. <?php echo "This is the output from a PHP echo command."; ?>, but the output from that command would not be displayed, either.

[ More Info ]

[/os/os-x/apache] permanent link

Fri, Feb 03, 2017 10:54 pm

Running an Apache web server under OS X El Capitan

Apple's OS X/macOS operating system (OS) comes with the Apache webserver software, which I decided to enable on my MacBook Pro laptop running OS X El Capitan, version 10.11.6 on the laptop.

The Apache web server software isn't running by default and you can no longer enable it through the Sharing option under System Preferences as in some earlier versions of OS X, but you can start it from a command line interface (CLI) by opening a Terminal window (Terminal is found in the Applications/Utilities folder), with the command sudo apachectl start. Once you start the software, you will see the system is listening on the well-known port for Hypertext Transfer Protocol (HTTP) connections, port 80, by using the netstat command.

$ sudo apachectl start
Password:
$ netstat -a | grep http | grep LISTEN
tcp46      0      0  *.http                 *.*                    LISTEN     
$

[ More Info ]

[/os/os-x] permanent link

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