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Week 12, Intro to Unix lab 2016

Content

  • test
  • umask, named pipes

Bonus == Homework

Pick one option for 3 points for homework

  • Write a script junk_finder.sh [-o | -s | -t] [-hbkmg] [dir_path ...]
  • (3 points per one option) The options [-o | -s | -t] are mutually exclusive and if none specified -t default option is assumed
  • The script accepts a list of directory paths and if none is provided the current path is used.
  • Option [-h] prints a help similar to this homework descriptions but which is formatted as in other standard Unix utilities
    • The option should print a section LEGAL NOTICE where you state your nickname (and name)
      • The option LEGAL NOTICE should also contain license. I encourage you to use Apache 2.0 license.
  • The options -b, -k, -m, -g determine a unit with which the script is reporting the file size. The default one is -b
    • -b - the script reports sizes in bytes
    • -k - the script reports in kilobytes
    • -m - the script reports sizes in megabytes
    • -g - the script reports sizes in gigabytes
    • report only integers, but document how do you round the numbers
  • For option -t the scripts computes sizes of all files in directory paths but reports the sizes of files only per file of the files.
    • For finding out the file types it is recommended to use file --mime-type command
    • For example it will report the total number of pdf files, text files, postscript files in the current directory
  • For option -o print relative path and sizes of files which were not modified at least one month and also belong to 10% of files under examined directories which are the oldest (were modified the longest time ago).
  • For option -s the script reports the sizes of directories and files in breadth first (top down) manner.
    • It first reports the names and sizes of of top-level directories given as arguments
    • Then it reports sizes and the relative paths to files and directories in the top level directories and so on.
    • Note that this option may be very computational demanding and nontrivial level of caching precomputed information is expected.