리눅스 파일, 디렉토리 명령어(linux file/directory command) 2. modifying

1. copy file

cp src dst

• src, dst can be multiple files delimited with spacebar(‘ ‘)

• src must exist

• if dst not exist, create(can be renamed)

• if dst exist, replace(overwrite)

* option

-p	preserve time/permission
-i	interactive prompt(asking overwrite)
-r	recursive(all files/directories under directory) copying

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2. move file

cp src dst

• src, dst can be multiple files delimited with spacebar(‘ ‘)

• src must exist

• if dst not exist, create(can be renamed)

• if dst exist, flush its contents(data)

* option

-f	force
-i	interactive prompt(asking flushing)

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3. file system

• Boot block

   load kernel into memory

• Super Block

   file system information

   disk size, free blocks, bad block locations

• Inode Block

   information node for each file

   owner, type, permission, address

• Data Block

   real files

link is logical relationship between filename Inode number

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4. remove

rm file

* option

-f	force
-i	interactive prompt(asking flushing)
-r	recursive(all files/directories under target)

rm doen not delete a file. It’s just remove the link.
Such that file can be recovered

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5. link

if edit original file, linked file is also changed.

5-1 hard link vs soft(symbolic) link

hard link

ln shared_file link_name

   same inode: same data on dist

   if delete original file, hard linked file remain its data

symbolic link

ln -s shared_file link_name

   different inode: file pointer

   if delete original file, symbolic linked file makes error(broken link)