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An Docker image is basically a big tarball containing a filesystem.

Learn how to work with Docker Container

Most common Docker commands.

Docker is a platform that manages application using containers. Docker packages application and its dependencies as a container. It also provide an intuitive interface for users to interact with Containers. Docker is widely used as a tool for application deployment.

curl - transfer data to and from the web. With curl you can easily interact with REST API.

wget - download files from the web. It supports HTTP , HTTPS , and FTP protocols, as well as retrieval through HTTP proxies. It is non-interactive.

compare the contents from two files

poweroff, halt and reboot are commands to stop system hardward.

date - display or set system time.

alias - Creates aliases. Alias are simple names for commands.

ping - test if a host is reachable on a network by sending ICMP ECHO_REQUEST to network host.

xxd - create hexadecimal representation(hexdump) for a file. use it to view files in binary or hexadecimal.

ln - create hard link or symbolic(soft) link to files and directories.

free - Display amount of free and used memory in the system.

xargs can be used to process the files return from find command.