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2nd part


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2nd part

  1. 1. Operating Systems 2nd. Part
  2. 2. Directories <ul><li>Usually file systems have directories or folders to keep a record of files.
  3. 3. The simplest form of a directory system is to have a directory containing all the files. Sometimes, it's called the root directory. </li></ul>
  4. 4. Calls for File System Unix <ul><li>Open
  5. 5. Read
  6. 6. Write
  7. 7. Close
  8. 8. Create </li></ul>
  9. 9. Hard Link A Hard Link is where a file has two names which are both on an equal weighting, and both of the file names in the &quot;inode table&quot; point directly to the blocks on the disc that contain the data. Example: ln melink melink2
  10. 11. Symbolic Link <ul><li>A Symbolic Link is where a file has one main name, but there's an extra entry in the file name table that refers any accesses back to the main name. This is slighly slower at runtime that a hard link, but it's more flexible and much more often used in day to day admin work.
  11. 12. Example: ln -s melink melink3 </li></ul>