Tag: cli

Linux and Docker on Ubuntu Series

May 11, 2022 /

Linux basic commands (Ubuntu)

Linux Kernel and hardware

Linux Runlevels

Linux Package Management for Ubuntu

Linux User Management commands

Linux Networking commands

Install Docker on Linux

Linux File Types

Create a file in Linux

How to check the file size in Linux

Compressing and Uncompressing Files in Linux

Searching files and directories in Linux

Search content with pattern in the file in Linux

Search content with pattern in the file in Linux

File Permissions in Linux

Check running services in Linux

DOCKER–

Docker FAQ’s

Install Docker on Ubuntu

Install Docker using install script on Ubuntu

Setup a Docker Swarm

Cache Busting and Version Pinning when building Docker images

Docker storage on Ubuntu

How to start docker in debug mode in Ubuntu

Docker Restart Policies

Use Docker image offline with Save and Load command in Ubuntu

Export Container and Import as Image using Docker in Ubuntu

Create a custom network in docker for communication between containers

Dcoker Security

Docker Best practice

Ubuntu – Package Management

December 6, 2021 /

DPKG – Debian Package Manager used to install, uninstall, list and check the status of the package

It comes with .deb file.

DPKG does not honour dependecies hence we need to use APT for Ubuntu

APT stands for Advanced Packaging Tool and relies on DPKG

Use apt update command to refresh the repository-

sudo apt update

Use apt upgrade to upgrade exisitng package-

sudo apt upgrade

To install a package-

sudo apt install <package name>

To uninstall or remove package-

sudo apt remove <package name>

To search package e.g:- python-dev

sudo apt search python-dev

To list all the packages in repository-

sudo apt list

Linux File Types

December 5, 2021 /

Everything in Linux is file

There are following type of files-

Regular files – Images/scripts/configuration and Data files

Directory – Type of files which saves other files and directories

Special files – have other types

  • Character Files – Represent devices – like Mouse and keyboards
  • Block Files – Represent block devices that writes data in chunk to the devices like HDD and RAM
  • Links – Hard links and Soft Links
  • Socket Files – enables the commnuication between 2 process
  • Named Pipes – passes data from one process to another

Use file command to get the file type-

file <<filename>>

Use ls -ld command to get the file type-

ls -ld firstfile.txt

First character represents the file type

IdentifierFile Type
dDirectory
–Regular File
cCharacter Device
lLin
sSocket File
pPipe
bBlock Device

Filesystem Hierarchy

/- Root Partition

/opt – any third party program should be put in this directory

/mnt- mounts the file system from external network temporary to this folder

/tmp- copy any temporary files to this location

/media – copy any media files in this folder

/dev – contains the file character device file like external devices like mouse and keyboard

/bin – basic programs and binaries are located in this directory

/etc – configuration files

/lib and /lib64 – contains shared libraries

/usr – user related data reside in this folder

/var – system writes data such as logs