Ansible remove blank lines from file


  • sed: remove all leading and ending blank whitespace from a file
  • 5 Ways to Empty or Delete a Large File Content in Linux
  • How to Replace Strings and Lines with Ansible
  • How to Remove Lines from a File Using Sed Command
  • Adam the Automator
  • sed: remove all leading and ending blank whitespace from a file

    Conclusion Prerequisites This post will be a step-by-step tutorial on the Ansible lineinfile module. The remote Linux computer will be called myserver, and the tutorial will use an inventory group called web.

    Ad hoc commands are a quick way to test or run a single command on a remote host. Log onto your Ansible controller and run the following command. This command uses the lineinfile module -m to connect to the web machine and pass an argument -a which is the command to execute. In this instance, the lineinfile module updates the localhost entry by mapping IP-address By mapping the The web is the inventory group that is a collection of all servers.

    As you can see below, the localhost entry has successfully been updated with Instead of using ad-hoc commands, consider using Ansible lineinfile module within the playbook using the ansible-playbook command.

    This playbook has multiple tasks that use Ansible lineinefile module to manage lines of different config files for Apache on the remote machine.

    The playbook below contains the following tasks: 1. Ansible playbooks are written in YAML. Now, invoke the playbook and execute the tasks using the ansible-playbook command to add or update all the lines defined in the playbook on the remote host. Verifying the sudoers file Again, the below screenshot confirms that the apache is listening on Port by default.

    Verifying the ports for in the config file Finally, verify the MaxKeepAliveRequests and KeepAliveTimeout if they have been updated to and , respectively. The module provides a great way to add, remove and modify lines in text files within your playbooks. What other use cases do you see would benefit from the Ansible lineinfile module?

    5 Ways to Empty or Delete a Large File Content in Linux

    Categories Linux Commands 14 Comments Occasionally, while dealing with files in Linux terminal, you may want to clear the content of a file without necessarily opening it using any Linux command line editors. How can this be achieved? In this article, we will go through several different ways of emptying file content with the help of some useful commands. Caution: Before we proceed to looking at the various ways, note that because in Linux everything is a file , you must always make sure that the file s you are emptying are not important user or system files.

    With that said, below are means of clearing file content from the command line. This is normally done by redirection mechanism. A string is already an object much as it may be empty while null simply means non-existence of an object. For this reason, when you redirect the out of the echo command above into the file, and view the file contents using the cat command , is prints an empty line empty string.

    To send a null output to the file, use the flag -n which tells echo to not output the trailing newline that leads to the empty line produced in the previous command. Empty File Using truncate Command The truncate command helps to shrink or extend the size of a file to a defined size. You can employ it with the -s option that specifies the file size. To empty a file content, use a size of 0 zero as in the next command: truncate -s 0 access.

    These are not probably the only available practical ways of doing this, so you can also tell us about any other methods not mentioned in this guide via the feedback section below.

    How to Replace Strings and Lines with Ansible

    In this article, we will go through several different ways of emptying file content with the help of some useful commands. Caution: Before we proceed to looking at the various ways, note that because in Linux everything is a fileyou must always make sure that the file s you are emptying are not important user or system files.

    With that said, below are means of clearing file content from the command line. This is normally done by redirection mechanism. A string is already an object much as it may be empty while null simply means non-existence of an object.

    For this reason, when you redirect the out of the echo command above into the file, and view the file contents using the cat commandis prints an empty line empty string. As you can see below, the localhost entry has successfully been updated with Instead of using ad-hoc commands, consider using Ansible lineinfile module within the playbook using the ansible-playbook command.

    How to Remove Lines from a File Using Sed Command

    This playbook has multiple tasks that use Ansible lineinefile module to manage lines of different config files for Apache on the remote machine.

    The playbook below contains the following tasks: 1. Ansible playbooks are written in YAML. Now, invoke the playbook and execute the tasks using the ansible-playbook command to add or update all the lines defined in the playbook on the remote host.

    Adam the Automator

    Verifying the sudoers file Again, the below screenshot confirms that the apache is listening on Port by default. Verifying the ports for in the config file Finally, verify the MaxKeepAliveRequests and KeepAliveTimeout if they have been updated to andrespectively. The module provides a great way to add, remove and modify lines in text files within your playbooks.


    thoughts on “Ansible remove blank lines from file

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