Tuesday, March 11, 2008

CSE 2031 Lecture 15

Man ulimit | col 0b > foo.mantxt


 

Filesystem

  • Filesystem is an organized structure consisting of many files and / or directories
  • A file is a stream of bytes
    • Stores data
    • Has a name
    • Usually on disk or some other storage medium
  • A directory is a special file in the filesystem which contains files and other directories
  • Unix filesystem
    • Bin
    • Usr
    • Etc
    • Users
      • Admin
        • John
        • steve
      • Staff
      • student
    • lib
  • drwx------
    • read write execute
    • d = filetype
      • d for directory
    • a normal file would have a – where the d is
  • %ln marks cpOfMarks
    • Creates a new link to marks
    • Puts in a new name associated with the same inode number
  • Inode
  • Name
  • 1042
  • Temp
  • 3784
  • Prog.c
  • 4798
  • Marks
  • 4798
  • cpOfMarks
  • you need links if you have a file on another partition
  • pwd shows the current working directory
  • cd changes current directory
  • a path name is a reference to something in the filesystem
  • a path name specifies the set of directories you have to pass through to find a file
  • directory names are separated by "/" in Unix
  • special elements : "." And ".."
  • "." Means "the current directory"
  • ".." means "the parent directory"
  • /dec/tty – the terminal you are using
  • /dev / zero – an input stream which returns an edless stream of null bytes
  • ls day?
    • Ls –ld day?
      • Ls –ld day1 day2 day3 day4 day5
    • The ? goes thru all the files that say day
    • And then wildcards the rest of the names

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