Note: Use command line flags to prefix scripts with multiple parameters. (For example: -d or -p or ...) Search for a module that will do this function.

Project #1

List all of the files in a directory tree:

• List all of the files in a directory tree.
• Skip all special files (dot files).
• Accept a starting directory on the command line.
  If none is entered, asking the user to enter a starting directory.
  If none is given, use the current directory.
• List the names of the files in each directory in sort order.
• Display the directory (or sub-directory) path before listing the files found there.
• Use a recursive function.
• If "--help" or "-h" is entered on the comand line, display help text and exit the script.
  (Should "--help" or "-h" be case insensitive.)

Project #2

List all of the files in a directory tree that match a regular expression pattern:

• Modify project #1
• Accept a regular expression pattern on the command line.
  If none is entered, asking the user to enter a pattern.
  If none is given, exit the script.
• List all of the files in a directory tree that match the pattern.

Project #3

List all of the files in a directory tree owned by a specified user:

• Modify project #1
• Accept a user name on the command line.
  If none is entered, ask the user to enter a user name.
  If none is given, exit the script.
• List all of the files owned by a user.

Project #4

List all of the files in a directory tree >= to a specified size:

• Modify project #1
• Accept a size on the command line.
  If none is entered, ask the user to enter a size.
  In none is given, exit the script.
• List all of the files >= to a size.
• see the following code example:
  import os, sys
  statinfo = os.stat('abc.py')
  print (statinfo)

Project #5

Rename all of the files in a directory or directory tree:

• Match file names using regular expressions.
• Rename matched files.
• List the files old and new name.

Project #6

Search a directory or directory tree for files:

• Ask the user for a partial file name.
• Match file names.
• List the files.

Project #7

Given two directories:

• list the files in one directory and not the other.
• List the files in in both directories.

Given N directories:

• list the files in only one directory.
• List the files in that are in only two directories.
• To keep the testing simple, use three or four directories.
  However, the program should work for N directories.

Project #8

Count the words in a text file and display statistics.

What is a word?

• words are one or more characters seperated by spaces (whitespace)
• the last word in a sentence may have punctuation as its last character
• a word may also have punctuation as its first character (i.e."abc")
• some words are capitalized but are the same word (i.e. The and the)

The program should do the following:

• read a text file (ASCII vs UTF-8?)
• count the total number of words in the file
• Count how many times each word was found in the file
• display the total of words in the file
• display the number of times each word was found in the file. (sort the words before displaying the counts.)

Download and use the text files for testing:

• Declaration of Independence
• Gettysburg Address

Note: Search for Python functions and methods that can split a line of text into individual words.

Project #9

Search text files in a directory for a string pattern.

This will be a limited version of the Linux GREP utility.

The program should do the following:

• ask the user for a regular expression to match
  • the names of files to be searched
  • the text in the files to search for
• provide default values for the regular expressions
• search all of the files that match the regular expression
• for each line that matches print
  • the file name
  • the line number
  • the complete line
• do case insensitive searches
• search the current directory

An example of possible output

---------- My Grep Utility -----------------------

Enter regexp search pattern [error] : xyz

Enter regexp file name pattern [\.py$] :

==================================================
Start time      = Dec 8 2007 23:41:45
File pattern    = \.py$
Directory       = ./
String pattern  = xyz
==================================================
xyz.py[7]  import xyzconfig as ABC
xyzconfig.py[2]  # configuration parameters for xyz
==================================================
Dirs processed  = 1
Files processed = 61
Lines matched   = 2
Lines processed = 3090
==================================================

After it is working try adding ...

• add case sensitive and insensitive searches
• search a directory and sub-directories
• add multiple regular expressions for the searches