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I have applied updates in my Ubuntu Linux machine how do I check what updates are applied?

Posted on October 1, 2018 by Charanjit Cheema

Whenever you apply an install/update/remove any package or packages Ubuntu log the changes happened to packages in its default file /var/log/dpkg.log. If you do listing to /var/log/ path (below is the command) you may find numbers of uncompressed and compressed dpkg.log files it depends on what type of log rotate policy is configure in file /etc/logrotate.conf

To list out numbers of available dpkg.log files below is the command:

ls -ltrh /var/log/dpkg.log*

Below is the sample output of available dpkg.log files in my Ubuntu 16.04 Linux machine.

You can use below commands for checking the installed, remove and applied updates to packages in your Ubuntu machines:

tail -f /var/log/dpkg.log

If you want to only filter out what packages are updated in your Ubuntu machine, below is the command:

grep upgrade /var/log/dpkg.log

Below is the sample output of /var/log/dpkg.log file of my Ubuntu Linux machine:

You have notice in above sample output file all logs are logged with date and time when updates were applied even apart from updates you can get the information regarding installed, removed of packages on that perticular date and time (Date and time format: YYYY:MM:DD HH:MM:SS).

Introducing another log file /var/log/apt/history.log it contains clear crystal output of installed, remove and applied updates of packages with details. Example for getting exact applied updated packages detail with particular date use below command:

grep -A4 'YYYY:MM:DD' /var/log/apt/history.log

Below is the sample of my Ubuntu machine /var/log/apt/history.log log as you can see I have applied packages update recently on 30th Sep 2018. You can see in below screenshot apart from date, which command was used for applying update and which user had requested or executed that command. Which is helpful in auditing the machine.

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Charanjit Cheema
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Charanjit Cheema
Charanjit is currently working as a Cloud Architect at Mphasis, with 17 years of experience in IT infrastructure projects, implementation, and support. While his main role is as a DevOps engineer, he holds a Cloud Architect position and has strong skills in cloud technologies and automation. His expertise includes Terraform, Ansible, AWS, Azure DevOps, Azure Cloud, VMware, and Linux systems.

Charanjit is passionate about automating tasks and improving processes. He uses tools like Terraform and Azure DevOps to build and manage cloud infrastructure and streamline deployment. He also enjoys using Shell scripts and Ansible playbooks to make systems run more efficiently.

In his free time, Charanjit enjoys learning about new technologies and sharing his knowledge through his blog. When he’s not working, he likes listening to music, having a cup of coffee, and relaxing in nature.

You can connect with Charanjit on Twitter, Facebook, LinkedIn, or email him at charanjit.cheema@cjcheema.com.
Charanjit Cheema
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2 thoughts on “I have applied updates in my Ubuntu Linux machine how do I check what updates are applied?”

  1. Naren Chand says:
    October 1, 2018 at 8:29 pm

    Very informative content, i was looking for that only.
    Thanks Charanjeet.

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    1. Charanjit Cheema says:
      October 3, 2018 at 5:44 am

      Thanks Naren for your valuable comment. Happy to see you like this tutorial.

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