Linux

• Shell/terminal: Configure the OS from a command line.
• Yellowdog Updater (YUM): Open-source CLI for downloading packages in Debian-based OS.
• Samba allows Unix-like OS to provide file and print services to Windows clients.
• man: display help for commands.
• Ls: list files in a directory.
• Mv: move or rename a file.
• Cp: copy a file.
• Rm: remove a file.
• Mkdir: create a new folder.
• Df: display free storage space.
• Ps: display a list of running processes.
• Apt-get remove uninstalls an application.
• Advance Packaging Tool is a CLI utility to install, uninstall and upgrade applications in Debian-based distributions like Ubuntu.
• Apt-get upgrade installs the latest version of installed applications. (Red-hat distros)
• dd is used to copy a partition.
• Apt-get install: installs a new application.
• Chown is used to change the owner and group of a file.
• sudo: temporarily grants administrator powers to allow the execution of a single Linux command requiring root access permission.
• Chmod is used to change the permissions of a file or folder.
• Apt-get update: updates the version list of installed applications.
• Read/Write/Execute are different permissions grantable to a user or a group.
• Top: displays running processes and resource usage. (task manager)
• Find: search for files and directories.
• Grep: search with regular expressions.
• Dig: Displays DNS information (troubleshooting command).
• Cat: display the contents of a file.
• Nano: text editor.
• Pwd: Check current working directory.
• Ip: displays and configure a NIC.
• df: Display available space in the disk
• sudo: elevates the user's privileges to root.