File

• A set of bytes to store data

• Each file has a filename

• – A label referring to a particular file
• – Permitted characters include letters, digits, hyphens (-), underscores (_), and dots (.)

요즘은 호환을 위해 다른문자도지원함

• – Case-sensitive

• – File name starting with “.” means it is a hidden file

  • The “ls” command lists the names of files

“ls” command

– List the names of files

• Options

• – -a : do not hide entries starting with “.”
• – -l : use a long listing format
• – -i : print index number of each file
• – -F : print file type (*: execution, /: directory, @: symbolic link)
• – -R : Recursively print directory contents

-rw-rw-r– 1 peterpan peterpan 57137735 Jun 10 2014 Floodlight.tar.gz

여기서 숫자 -> 파일일경우 하드 링크, 폴더일경우 안에있는 파일의 수

Creating files with “cat” • “cat” command

$ cat > shopping_list cucumber bread yoghurts

• “>” sign means redirection of text types to the file “shopping_list”

• Press “Ctrl+D” after a line break to denote the end of the file

  – The next shell prompt is displayed

• “ls” demonstrates the existence of the new file

cat으로 파일 만들고, (cat > dde)

cat dde로 파일내용 볼 수 있음.

’>’ 의 의미 : redirect