[LINUX] Day1: Learning Linux - the beginning

11/15/2019


All references are going to be based on this blog  초코몽키의 개발공부로그

Daily log for what I learn for the day: summaries and notes

1. What is Linux? Linux Journey

 Linux Shortcuts 1 (Basic)

  1. echo: Display text arguments
  2. pwd: Print working directory
  3. cd: Change Directory
    • cd . : Current directory
    • cd .. :Directory above your current
    • cd ~ : Default directory
    • cd - : previous directory you were just at
  4. ls: List Directories
    • ls -a: view hidden directory
    • ls -l: Shows a detailed list of files in a long format
    • ls -a: Shows everything -l and -a
  1. touch: Create new empty files
  2. file: To find out what kind of file it is
  3. cat: displays contents and combine multiple files and show the output 
  4. less: display in file so that can navigate through a text file page by page
    • q: quit out of less and go back to your shell
    • Page up, Page down, Up and Down: Navigate using the arrow keys and page keys
    • g: Moves to beginning of the text file
    • G: Moves to the end of the text file
    • /search: You can search for specific text inside the text document. Prefacing the words you want to search with /
    • h: If you need a little help about how to use less while you’re in less, use help
  1. history: show the history 
  2. clear: clear your display
  3. cp: copy files
    •  * : wildcard of wildcards
    • ? : represent one character
    •  [ ] used to represent any character within the brackets
    • cp -r : recursively copy the files and directories within a directory
    • cp -i : prompt you before overwriting a file
  1. mv: move files and also renaming the 
    • mv -i : prompt you before overwriting a file
    • mv -b: allow to backup of that file and rename the old version with a~
  1. mkdir: Make Directory
    • mkdir -p : can create subdirectories at the same time 

  1. rm: Remove files
    • rm -f : can remove a bunch of files
    • rm -I: can remove all whether they are write protected or not, without prompting the user
    • rm -r: whether you want to actually remove the files or directories
    • rmdir : cant remove default but can remove all the recursive and any subdirectories it may have
  1. find: can find specific file
    • ex. $ find /home -name puppies.jpg
    • ex. $ find /home -type d -name MyFolder
  1. help: can also use with echo, logout, pwd, etc
    • help echo: description of options
    • help echo: description of options
  1. man: can see the manuals for a command. Man pages are manuals that are by default built into most Linux operating systems. They provide documentation about commands and other aspects of the system.
  2. whatis: gives brief description of command line programs
- eg. whatis cat
  1. alias: to create alias for a command you simply specify an alias name and set it to the command
- eg. $ alias foobar = ‘ls -la’
- eg. $ unaries foobar: execute that command
  1. exit or logout: close terminal


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