![]() This switch will interpret a pattern as an extended regular expression. On modern Linux systems, you will find these switches available in the base grep command, but it’s common to see distributions support the other commands as well. Various grep switches were historically included in different binaries. Difference between grep, egrep fgrep, pgrep, zgrep Notice that we only needed to use quotes around the strings that contained spaces. Let’s try searching a text document for two different strings: $ grep -e 'Class 1' -e Todd Students.txt You can specify multiple patterns by using the -e switch. You can also use grep to find multiple words or strings. ![]() Here’s an example where we search a text document for a string. While you can use grep to search the output piped from other command-line tools, you can also use it to search documents directly. Grep will accept both single quotes and double quotes, so wrap your string of text with either. For example, what if we needed to search for the “My Documents” directory instead of the single-worded “Documents” directory? $ ls | grep 'My Documents' If you need to search for a string of text, rather than just a single word, you will need to wrap the string in quotes. So if grep returns nothing, that means that it couldn’t find the word you are searching for. If the Documents folder didn’t exist, grep wouldn’t return any output. $ ls | grep DocumentsĪs you can see in the screenshot above, using the grep command saved us time by quickly isolating the word we searched for from the rest of the unnecessary output that the ls command produced. Let’s look in our home directory for a folder called Documents.Īnd now, let’s try checking the directory again, but this time using grep to check specifically for the Documents folder. That’s something you would use the “ls” command for.īut, to make this whole process of checking the directory’s contents even faster, you can pipe the output of the ls command to the grep command. Say that you need to check the contents of a directory to see if a certain file exists there. All these methods are practically demonstrated in this post.Let’s look at some really common examples. While the networks settings option in the GUI of Linux will give you the initial details about the MAC addresses. ![]() For the command line, use the ‘ifconfig’ and the ‘iplink’ commands in the terminal. MAC addresses of the devices, such as networks or Bluetooth, can be checked using the command line and the graphical interface. The hardware address represents the MAC address of the currently selected network device. After that, click on the wheel-like button under the “Connection (Wired in our case),” highlighted below.Ī new menu will pop up that basically is the advanced settings of the network, and here you will see different settings and information, including the MAC address highlighted in the below image. To look up the MAC address of your network device, you need to go to settings and click on the “Network” tab. Method 2: How to Look Up MAC Addresses in Linux through the GUI? Finally, the output has shown the MAC address only on the terminal. If we look at the above command, the grep parameters are the same as we used in the ip link command.
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