![]() ![]() Enabling Syslog Messages in Access Points and Controller for Syslog Server.Predownloading an Image to an Access Point.Cisco Connected Mobile Experiences Cloud.Unscheduled Automatic Power Save Delivery.802.11 Parameters for Cisco Access Points.Converting Autonomous Access Points to Lightweight Mode.Overview of Cisco 9800 Series Wireless Controllers.For more of his writing, check out his blog on medium. He writes about software architecture, scaling, leadership, and culture. Hughie Coles is a lead developer at Index Exchange. If you only need a file to exist, but don't mind (or require) it being empty, using touch is a great alternative. You can use it to create, display, and combine text files very quickly and easily. Touch is commonly used to ensure that a file exists, and is a great command if you need an empty file quickly. The touch command can create multiple files, update the modification and/or creation timestamps, and a bunch of other useful things. Here is an example of that usage: touch new_file_name The touch command was designed to update the modified timestamp of a file, but is commonly used as a quick way to create an empty file. As an alternative to using cat to create a file, you can use the touch command. This is a fantastic way to create a file quickly with the ability to enter the content of the file. If you have uncommitted text and exit, it won't be captured in the file. We can also use cat's interactive mode to create a file with the text that we type into the terminal.Įach time you hit enter, it commits the text to the file. We've created 3 files, then combined them into a single file using cat In the above example, we're creating 3 files using echo, combining the 3 files into one using cat, and then displaying the new combined file using cat. We can create a file containing the concatenation of multiple files like this: echo "File 1 Contents" > file1 In fact, we can use cat's concat and echo functionality to create files. ![]() In the previous examples, we've been using the echo command redirected to a file to create new files. This will result in the following output: Piping text into cat Creating a File You can also pipe text to cat, in which case that text is echoed. Each time I hit enter, the line was echoed. In the example here, I've typed a single word per line. If you run the cat command with no commands, cat will run in interactive mode and echo anything you type until you exit the command. This is a less common usage of cat, but is the basis for the next section. A complete breakdown can be found in the man pages. The output of two files concatenatedĬat also provides some switches to to do things such as show non-print characters (-v), or number your lines (-n). Notice however, that the cat command automatically inserts a line break between outputs. You can give cat many files and it will concatenate (combine) all of them. The output is the contents of the 1st file, followed by the contents of the 2nd file. If we run the following commands: echo "This is how we do it" > test1 #create 1st fileĮcho "*This is how we do it*" > test2 #create 2nd file If we use the command the same way, but give it two or more files, then it outputs the concatenation for the files. The previous example is actually a specific case of the cat command's main function, which is to concatenate files for display. The output is as follows: The output of the example commands (Con)cat We then use the cat command to display the contents. In this simple example, we're using a combination of echo and a redirect to create a file containing "Dance, Dance". echo "Dance, Dance" > cat_create #create a file The following is an example that you can try. The most common use of the cat command is to output the contents of a file. ![]() It can display a file, concatenate (combine) multiple files, echo text, and it can be used to create a new file. There are 4 common usages of the cat command. The cat command is a very popular and versatile command in the 'nix ecosystem. ![]()
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