Command Line

Whether performing a packet trace or sniffing and capturing packets from a network, the result is usually the creation of a .cap capture file. That .cap, pcap, or wcap packet capture file is created regardless of what you’re using to sniff a network, a fairly common task among network administrators and security professionals. Perhaps the … Read More

If you use VirtualBox to run guest operating systems within a virtual machine on the Mac, like Windows 10 or Ubuntu Linux, you may find yourself needing to resize the virtual disk size where the OS resides. This is often the case when you inadequately estimate how much space is required for properly installing in … Read More

Each release of MacOS or Mac OS X has a unique build number assigned to it to represent the changes found in that version of system software, often these changes are minor and incremental, but with major Mac OS X releases the build numbers can change significantly. Though average Mac users won’t need to know … Read More

All domains are associated with an IP address, whether it’s for a website, mail server, or whatever else. While using nslookup offers a simple way to get DNS information and an IP for a specific website or domain, if you want a significantly more detailed retrieval, you can use the host command instead. The host … Read More

Using FileVault full disk encryption is one of the better ways to protect your Mac and personal documents from prying eyes and password resets, but if you’re troubleshooting a Mac with FileVault, either your own or someone else’s, it’s kind of annoying to have another layer of passwords necessary to enter before you’ll be able … Read More

Though most advanced Mac users will find it easiest to enable root with Directory Utility from the GUI of Mac OS X, another option is to turn to the command line. No, we’re not talking about using sudo or su, we’re talking about enabling the actual root user account, which can be appropriate for some … Read More

Have you ever needed to flatten a directory structure, moving all file contents from a directories child folders into a single folder? While you can do this manually by moving around files and folders from the file system of Mac OS X or Linux, a faster option is to turn to the command line. Maybe … Read More

Sometimes you need to enter a password into the terminal, usually for sudo or su commands, which lets users execute a command with super user privileges. This is fairly typical for allowing access to read or modify something that would otherwise not be possible with a standard user account. You’ll commonly see sudo prefixing another … Read More

Mac users can adjust the idle time to sleep their computers easily through the Energy Saver preference panel, but many advanced Mac OS X users may wish to turn to the command line to perform such a task. This allows for scripting, remote checking and changing idle sleep behavior through SSH, and you can also … Read More

The default text size used by Terminal app in OS X can be quite small if you’re using a large resolution display. While you can change the font to be better suit your preferences, and increasing the line spacing helps reading too, another simple solution to boost readability is to simply increase the text size … Read More

In some unusual and admittedly rare situations, fonts in OS X and various Mac apps may display erroneously, or outright fail to display. Typically this happens after a font has been modified or a font has been installed outside of the standard ~/Library/Fonts directory, but it can happen out of the blue in some situations … Read More

When you hit the green maximize button to resize windows on a Mac or send things into full screen mode, a fancy visual animation shows the redrawing of the window size as the active window expands outwards. While this looks great and many users will be happy with the default resizing animation time in OS … Read More

If you’re a Mac user who finds the text output shown within Terminal app to be a bit too confined and tightly spaced, you’ll be pleased to discover that you can adjust the line spacing to accommodate your preferences. You can boost line spacing within Terminal dramatically or just a little bit (or if you … Read More

Spelling autocorrect features tend to be divisive, with Mac users usually either loving it or hating it. Most Mac users know they can easily turn off autocorrect through an OS X system preference change, but the System Preferences are only accessible from the graphical interface of a Mac. If you’re wanting to automate the enabling … Read More

Many command line users are familiar with the ‘man’ command that will open a manual page for a specific command, but what if rather than a specific commands man page, you’re looking for a string match within all man pages? That’s what this tricks is for, so whether you’re trying to learn more about a … Read More

Many developers require MySQL on their Macs, but if you’ve tried to install MySQL in OS X El Capitan and Yosemite, you likely noticed that you’ll get an “installation failed” error during the process. That error sounds worse than it is, because you can avoid it entirely by choosing not to install the startup item … Read More

Some Mac users may encounter situations where they need to flush DNS cache in OS X for a name server to resolve properly, or for some DNS address change to become noticed by their individual computer. This is particularly relevant for system administrators, network admins, and web developers, but there are certainly situations where other … Read More

Apple has released an important security update for Mac users, labeled as OS X Bash Update 1.0. The update addresses a recently discovered critical security flaw known as “Shellshock” that impacts the bash shell, the default shell used by the Terminal app of OS X, and is recommended for all users to install even if … Read More