Do this by moving the cursor back to the beginning with 0, and deleting the entire comment to the next comma with df,: 0df, Let's move the comment to the end of the line. Now the fields are almost in the desired order. Insert text at the end by using A and inserting a comma, then press p to paste the hostname: A,p Now, let's paste it at the end of the line. Remember, when you delete text in Vim, you also copy it. Next, move the cursor one position to the right using l, and delete the entire hostname until the next comma: ldf, Next, delete the next quotation mark by moving the cursor to it using the f command and pressing x to remove it: f"xĪt this point, your first line looks like this: #OCP Master Node 1,ocpmaster01,192.168.0.20, While you're in there, replace the quotation mark " character with the comment character #, so we don't need to do this when we move this field to the line's end later: r# This first field is the description, which becomes the comment at the end of the line in the output. Let's use the beginning of the line as the start point by pressing 0: 0 While you're recording the macro the status line at the bottom shows this message: recording it's a good practice to move your character to a known position, so the macro works the same way independently of where the cursor was located when the macro started. Then, start recording the macro by pressing q and h to save it to register h: qh Start by placing the cursor anywhere on the first line we want to change in the file: "OCP Master Node 1",ocpmaster01,192.168.0.20, Now, let's record a macro that converts the first line of our CSV file to the required format and save it on register h. For example, it's best to use the command dw to delete a word rather than repeating the command x to remove characters, because the number of characters in the word could vary from line to line. Keep in mind that you want this macro to be repeatable on other lines, even if the input varies somewhat. Recording macros in Vim is an exercise in logic and using Vim commands appropriately. While this macro is not useful, it exemplifies the sequence required to record any other macros. qqįor example, to record a basic macro that inserts a new line and save it to register a, use this sequence: qaoq To record a macro and save it to a register, type the key q followed by a letter from a to z that represents the register to save the macro, followed by all commands you want to record, and then type the key q again to stop the recording. The basic workflow of a Vim macro consists of recording your commands and keystrokes while doing the edits required to solve the problem on the first line, saving the command sequence to a register, and then replaying the macro to do the same on the remaining lines. Let's use Vim macros to handle this task. To obtain the expected output, you need to edit the input by switching the position of some fields, deleting the quotation marks, and inserting Tab or comment characters ( #) appropriately. The original file is this: $ cat hosts.csv You want to convert it to the /etc/hosts format to enable local name resolution for the hosts. Suppose that you receive a CSV file containing a list of hosts in your network from a hypothetical monitoring system. In this article, we'll explore the concept of Vim macros by applying it to a practical example. Macros improve your workflow and are a great time saver. Macros make tedious and repeatable tasks manageable by executing the task only once, then using Vim's power to automate it. You then execute that macro many times to repeat the same job in an automated way. In Vim, a macro is a feature that allows you to record a sequence of commands that you use to perform a given task. How well do you know Linux? Take a quiz and get a badge.Linux system administration skills assessment.A guide to installing applications on Linux.Download RHEL 9 at no charge through the Red Hat Developer program.
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