Code organization This program consists of several functions grouped into modules of related functionality: Tool cat tac Description Concatenate files and print on the standard output Concatenate and print files in reverse Remove sections from each line of files Merge lines of files Print lines of files matching a pattern cut Module Concatenate.py Concatenate.py CutPaste.py CutPaste.py Grep.py Partial.py Partial.py Sorting.py WordCount.py paste grep head Output the first part of files tail sort Output the last part of files Sort lines of text files P rint newline, word, and byte counts for each file WC Word Count tool ( wc ) The wc tool counts and prints the number of lines, words, and characters (bytes) present in a text file. Note that, due to differences in the representation of the end-of-line (EOL) sequence between operating systems, the byte count you see on Windows may vary from my examples. The character and word counts should remain the same. These examples were produced on Linux This example reports that the file dataum2 contains two lines, two words, and four characters $ python src/tt.py wc dataum2 $ python, sr 2 2 4 o dataum2 This example reports that the file data/words 200 contains 200 lines, 200 words, and 1790 characters $ python src/tt.py wc data/words 200 200 200 1790 data/words200 Multiple files may be given at once. In this case the grand total is reported at the end: 3 $ python src/tt.py wc data/let3 data/random20 data/words 200 data/dups 3 6 data/let3 20 20 51 data/random20 200 200 1790 data/words200 8 16 data/dup5 231 231 1863 total