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Jeroen W. Pluimers on .NET, C#, Delphi, databases, and personal interests

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Archive for the ‘OS X Maverick’ Category

Mac OS X – need to research this one day: How do I Check DHCP Lease info in terminal – via Ars Technica OpenForum

Posted by jpluimers on 2017/06/20

One day I need to research how to get the conversions right for this: How do I Check DHCP Lease info in terminal – Ars Technica OpenForum as I think that ipconfig getoption en0 lease_time gives me the value in a different format than date -r expects.

Also:

At T1 seconds (typically set to 0.5*lease_time) after the last successful renewal, the DHCP client attempts to renew it’s lease with the DHCP server that granted it’s current address via unicast. If unsuccessful, at T2 seconds (typically set to 0.875*lease_time) after the last renewal, the DHCP client attempts to rebind with any DHCP server via multicast.

–jeroen

Posted in Apple, bash, Development, Mac, OS X, OS X El Capitan, OS X Maverick, OSX Yosemite, Power User, Scripting, Software Development | Leave a Comment »

munki/createOSXinstallPkg: Tools for packaging OS X installers – upgrade Mac OS X from InstallESD.dmg

Posted by jpluimers on 2017/06/12

You can use this package to install OS X on an empty partition, but perhaps more interestingly, you can also use it to upgrade existing OS X installations to a newer version of the OS X. There are many tools and workflows that support the installation of Apple packages; you can use these together with an OS X installation package to upgrade machines to the latest version of OS X.This is especially interesting when used with tools like Munki — you can automate the upgrade of a group of machines while still preserving user data, or offer an upgrade as a “Self-Service”-type option where a user can initiate an OS X upgrade themselves without needing to have administrative rights.

I will probably need this one day.

Source: munki/createOSXinstallPkg: Tools for packaging OS X installers

–jeroen

Posted in Apple, iMac, Mac, MacBook, MacBook Retina, MacBook-Air, MacBook-Pro, MacMini, OS X, OS X El Capitan, OS X Maverick, OSX Yosemite, Power User | Leave a Comment »

Launch & Run Multiple Instances of Any Application in Mac OS X

Posted by jpluimers on 2017/04/17

I needed a second instance of Atom to run on a second monitor:

open -n /Applications/Atom.app

Or even shorter:

open -na Atom

I got there via: Launch & Run Multiple Instances of Any Application in Mac OS X

The reason is that searching for Mac OS X start second Atom instance does not reveal satisfactory results, as the tips in these links all fail:

–jeroen

 

Posted in Apple, Atom, OS X, OS X El Capitan, OS X Maverick, OSX Yosemite, Power User, Text Editors | Leave a Comment »

Getting your local IPv4 addresses, netmasks and CIDRs

Posted by jpluimers on 2017/04/11

In order to scan some local networks for unknown hosts (yes, on some sites you need to perform archeology), I needed the local IPv4 addresses, netmasks and CIDRs on my Mac running OS X.

Part of that is using ifconfig to get local inet information which however uses hexadecimal network masks and delivers no CIDRs.

SoI was a bit premature when I wrote about “This could be done by creating bash functions mask2cdr and cdr2mask, but that’s a bit too convoluted right now” in Getting the IP addresses of gmail MX servers – via Super User – dig isn’t enough.

netmask to CIDR and CIDR to netmask conversion

I need mask2cdr now, so lets start with these two bash functions and their aliases:

Read the rest of this entry »

Posted in *nix, *nix-tools, Apple, bash, Development, OS X, OS X El Capitan, OS X Maverick, OSX Yosemite, Power User, Scripting, Software Development | Leave a Comment »

OS X – the versions and their names – as I always forget them

Posted by jpluimers on 2017/04/03

I always forget which OS X versions there are and which names they use.

So via: OS X – Wikipedia, the free encyclopedia, I made this list where the first item points to the table in the above article and each subsequent item to the individual article on the version. I tried to find EOL dates, but that’s hard despite the overview at Apple security updates – Apple Support:

None of this would be noteworthy if Apple, like Microsoft and a host of other major software vendors, clearly spelled out its support policies. But Apple doesn’t, leaving users to guess about when their operating systems will fall off support. | Computerworld

–jeroen

PS: EOL dates are as of 20160403.

Posted in Apple, OS X, OS X El Capitan, OS X Leopard, OS X Lion, OS X Maverick, OS X Mountain Lion, OS X Snow Leopard, OS X Tiger, OSX Yosemite, Power User | 1 Comment »

 
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