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Tue, Feb 27, 2018 11:10 pm

Error message "You don't have permission to access / on this server."

I had been running an Apache webserver under OS X El Capitan on my MacBook Pro laptop. After an upgrade on the laptop, now running OS X El Capitan (10.11.6), when I tried accessing the site via http://localhost, I saw a page with the title "403 Forbidden" and the following text displayed on the page:


You don't have permission to access / on this server.

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

Thu, Feb 22, 2018 11:01 pm

Installing GIMP on OS X

To install the GNU Image Manipulation Program (GIMP) on OS X systems, take the following steps:
  1. Download the GIMP installation file from GIMP - Downloads. The file is an Apple Disk Image .dmg file.
  2. Double-click on the downloaded file to start the installation process.
  3. When the GIMP installation window opens, you will see "" in the window that opens. Click on "" and drag it over into a Finder window with the Applications folder displayed to complete the installation of the GIMP application into that folder.

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Wed, Jan 17, 2018 11:01 pm

Renewing a DHCP lease under OS X

If you wish to renew a Dynamic Host Configuration Protocol (DHCP) lease on a Mac OS X system, you can do so by clicking on the Apple icon in the upper, left-hand corner of the screen, selecting System Preferences, and then Network , and then the relevant network interface, e.g., Wi-Fi. Then click on the Advanced button and then the TCP/IP tab. You can then click on the Renew DHCP Lease button to have the system attempt to renew its DHCP lease.

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[/os/os-x] permanent link

Wed, Oct 25, 2017 10:36 pm

Viewing the fonts used in a PDF document on a Mac OS X system

To view the list of documents contained in a PDF document with Adobe Acrobat Reader DC on a Mac OS X system, with the file open in Acrobat Reader DC, click on File then select Properties and then click on the Fonts tab.

Adobe Acrobat Reader DC fonts list

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[/os/os-x] permanent link

Sun, Oct 08, 2017 10:57 pm

Calculating file checksums on an OS X system

If you need to calculate a checksum, aka cryptographic hash value or digital fingerprint, on a Mac OS X system, you can use the md5 command to calculate a MD5 checksum, which is equivalent to the md5sum utility on Linux systems, and the shasum command to calculate Secure Hash Algorithms (SHA). The default value for shasum, if no algorithm is specified, is Secure Hash Algorithm 1 (SHA-1), but you can specify other algorithms, such as Secure Hash Algorithm 2 (SHA-2), e.g. SHA-256, using the -a option. E.g. -a 256 for SHA-256.

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[/os/os-x] permanent link

Fri, Oct 06, 2017 11:15 pm

Viewing DHCP information on an OS X system

If you want to determine the IP address of the DHCP server from which a Mac OS X system received its IP address, subnet mask, etc., you can obtain that information from a command-line interface (CLI), i.e., a Terminal window by using the command ipconfig getpacket interface where interface is the relevant network interface, which will usually be en0 or en1. You can issue the command ifconfig -a in a Terminal window to see the network interfaces on the system and which have IP addresses assigned to them.

getpacket interface-name
Prints to standard output the DHCP/BOOTP packet that the client accepted from the DHCP/BOOTP server. This command is useful to check what the server provided, and whether the values are sensible. This command outputs nothing if DHCP/BOOTP is not active on the interface, or the attempt to acquire an IP address was unsuccessful.

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Wed, Jul 19, 2017 9:55 pm

OS X - Get File Info

On an OS X/macOS system, you may be able to determine a file's origin, i.e., where it was downloaded from, by right-clicking on the file, or clicking on it to highlight it and then hitting command-I (the command and "I" keys), in the Finder and choosing Get Info. If a "where from" field is displayed, you can see the URL from which the file was obtained if it was downloaded from a website. You can also view that information from a command-line interface (CLI), e.g., a Terminal window, using the mdls command.

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[/os/os-x] permanent link

Sat, Jun 24, 2017 2:36 pm

Modifying search domain settins under OS X

If you would like to be put a system's name in your web browser, e.g., ajax, into your browser's address bar and have the system automatically append a domain name, e.g., so that the browser attempts to access, even though you just typed ajax, you can modify the Domain Name System (DNS) search domain settings. To do so on an Apple OS X/macOS system, take the following steps:

  1. Click on the Apple icon at the top, left-hand side of your screen.
  2. Choose System Preferences then Network.
  3. Select the relevant network service, such as Wi-Fi or Ethernet, then click on the Advanced button.
  4. Click on DNS.
  5. Click in the Search Domains box and then click on the "+" at the bottom of that box to add a new search domain.
  6. Type the name of the search domain, e.g.
  7. Click on OK

You can add multiple domains; domains will be searched in the order you list them with the search starting at the topmost entry and continuing down through the list of domains with the search stopping when a valid name is found.

[ More Info ]

[/os/os-x] permanent link

Wed, Jun 14, 2017 11:02 pm

Installing Lynx with Homebrew

If you need a text-based web browser that doesn't require a graphical user interface (GUI), one alternative is the Lynx browser that is available for a variety of operating systems, including Linux, OS X/macOS, DOS, and Microsoft Windows. If you have the Homebrew package management software installed on a OS X/macOS system, you can use it to easily install the Lynx browser using the command brew install lynx.

Advantages to using a text-based browser such as Lynx, in addition to it not requiring a GUI, making it suitable to be run in a Terminal window, is that it doesn't support Adobe Flash, which makes it invulnerable to malware distributed through vulnerabilities in Flash. Also, because it doesn't support JavaScript nor graphics, it prevents tracking software that uses JavaScript or web bugs, aka web beacons, which can track your web browsing activities via small graphics files that will be invisible to you on a webpage, from being used to track your browsing activities. It does support HTTP cookies, though, which are also used by sites to track visitors, but Lynx will prompt you if you want to allow cookies for a site when you visit the site and has whitelisting and blacklisting capabilities. E.g., when a site tries to place a cookie on your system, Lynx will prompt you as to whether it should be allowed. You can choose from "Y/N/Always/neVer."

[ More Info ]

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

Tue, Jun 13, 2017 10:04 pm

Determining the version of Firefox on OS X

If you wish to determine the version of Firefox installed on an OS X from a command line interface (CLI), you can open a Terminal window and use the command shown below:

$ /Applications/ -v
Mozilla Firefox 45.8.0

You can also find the information in the Info.plist file found at /Applications/ The version number will be on the line following the "key" line for CFBundleGetInfoString and also after the "key" line for CFBundleShortVersionString .

        <string>Firefox 45.8.0</string>


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[/os/os-x] permanent link

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