Introduction to Systemd, how to start using systemd in RHEL 7 or Centos 7 ?
With introduction or RHEL7 or CentOS 7, we have a new concept introduced known as systemd. Personally i don’t liked the new concept as its a little bit complex to...
Category: Linux/Unix
In this category, you can see all articles related to Unix or Linux operating System.
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Why journalctl logs disappear after reboot and how to make it permanent ?
By default, Journald logs gets stored in /run/log/journal directory and disappear once the system gets rebooted. I. Default Journald configuration [root@localhost ~]# date Wed Mar 13 10:50:29 PDT 2019 [root@localhost...
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What are control groups in RHEL or CentOS 7 and how to view different cgroups ?
I. Introduction to C Groups Control Groups or CGroups were introduced in the Linux kernel by Google starting from 2006 onwards. Control group as its name implies can set a...
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How to list, stop, start, manage services in Centos or Redhat Linux 6 and 7 ?
Today we will look at an interesting topic how to manage services in CentOS/RHEL 6 and 7. We will look these step by step to understand it better. 1. List...
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How to create, list, delete alias or aliases in Redhat or Centos Linux ?
Today we will look at an interesting topic of alias or aliases in Redhat or Centos Linux. 1. List current aliases. alias and “alias -p” commands are synonym to each...
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How to pass multiple keystrokes or y to a command in Centos or Redhat Linux ?
In this post, we will check how to automate entering of multiple y’s to a shell command or script. This tip is very useful to sometimes automate few install scripts/commands....
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How to freeze and unfreeze your linux bash shell terminal ?
Today we will look at an interesting tip to freeze and unfreeze our linux bash shell terminal. How it works ? Freeze will freeze our terminal and we are not...
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Brief explanation how to read compressed log files in Centos or Redhat Linux.
Today we will look at an interesting topic “how to read compressed i.e. gzip files” in Linux. Lets see below example: 1. Reading .tar.gz compressed zip file in Linux. [root@nglinux...
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Tip: sudo in the last command in Linux bash shell quickly.
In this post, we will look at an interesting topic how to refer the last command in bash shell. Sudo last command quickly ### Run the command [nglinux@nglinux ~]$...
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Docker Basic Tips 1: How to download an image and work with containers ?
In this post, we will look at the tips of using docker to get images and creating & working with containers. 1. Pull an image: $ docker pull centos Using...