[LINUX][Lesson 0] Overview Introduction

1. Document for research :
– Linux Reference Links:

• https://www.k4.dion.ne.jp/~mms/unix/linux_com/
• https://www.dais.is.tohoku.ac.jp/~koike/tips/linux_command.html
• Linux Command: https://linuxcommand.org/

2. Some basic Linux commands

File / Folder:

• vi [file]: edit the content of a file.
• rm [file]: delete a file.
• cp (or scp) [file] [to_file]: copy a file.
• file [file]: display information about the content of a file.

Other:

• clear: clear the terminal screen.
• ls (or ll) [dir]: list the contents of a directory.
• cat [file]: display the contents of a file in the terminal.
• passwd: change password.
• less (or more)[file]: display the contents of a file in the terminal, one page at a time.
• info: display information and documentation on shell, utilities, and programs.
• grep [“String”] [file]: search for a string within a file.
• head [file]: display the first 10 lines of a file.
• tail [file]: display the last 10 lines of a file.
• mv [file] [new_file]: move or rename a file.
• echo [“String”]: copy a string to the terminal.
• date: display the current date and time.
• cal: display the calendar.
• gzip [file or folder]: compress a file or folder.
• gunzip [file or folder]: decompress a file or folder.
• who: display the users currently logged in.
• finger [username]@[server]: collect detailed information about the user currently using the system.
• w: display users logged in with their running processes.
• mesg y/n: set options to allow other users to send messages to you.
• write [username]: send a message to another user.
• talk username: allow two users to chat with each other.
• chmod [permissions] [file]: change the access permissions of a file.
• mkdir [folder_name]: create a directory.
• rmdir [folder]: delete an empty directory.
• top: display a list of all running services.
• kill [PID] or [number %job]: stop a service by its PID (Process Identification Number) or job number.
• jobs: display a list of current jobs.
• netstat: display network connections.
• nslookup: query DNS servers.
• hostname: display the system’s hostname.
• rlogin [server]: utility for connecting to a remote system.
• telnet [server]: utility for connecting to a remote system (similar to rlogin but with better interaction).
• rcp [file] [server]: used to copy files from a remote computer.
• ftp: utility for transferring files between systems on a network.
• rsh [command]: utility for running a command on a remote system without logging in.
• ping [server]: utility for checking the connection to a remote system.