Chapter 5: Linux Filesystem Management

1
Chapter 5 Linux Filesystem Management
2
Filesystem Hierarchy Standard (FHS)
3
Managing Files and Directories

• Directory creation, content listing, current
  directory (mkdir, ls, pwd, etc.)
• Copying, moving, renaming, removing files and
  directories (cp, mv, rm)
• Options -F, -r/-R, -i
• Alias current list, alias and unalias commands
• The use of f option with cp, mv, rm

4
Finding Files

• locate ltfilenamegt
• It searches all the file system for that file
• find ltlocationgt ltoptiongt ltfilenamegt
• If you want to use wildcards, you need to make
  use quotation
• Find can be used with other options other than
  name (-size, -type, -empty, etc.)
• Which command for executable
• Environment variables (PATH, etc. ) and their
  values

5
Linking Files

• Three sections of the file system
• The super block, The inode, and data blocks
• Each Information nodes (inodes) pertains to one
  file/directory and stored information such as
  size, permissions, etc.
• Hard links use the same inode for different files
• Hard links must resides in the same file system
• Deleting a hard links will not affect the
  original file
• The ln (link command)
• Using the i and F options with ls
• Soft/symbolic links use different inode numbers

6
Files and Directory Permissions

• Owner and primary group
• The commands whoami, who am I, groups, etc.
• Creating empty files
• Changing ownerships and group (chown and chgrp)
• Permissions and meaning

7
Permissions (Cont.)

• Permissions are additive
• Changing permissions (chmod)
• examples

8
Permissions (Cont.)

• Example chmod uw, gr-w, or-x file
• Example chmod urw, gr, or file
• Using numerical values with chmod
• Default permission and the umask command
• Special permission
• SUID
• SGID (new files in a directory will be the
  directory group)
• Sticky bit
• Demo