Suggested Steps to Implement freq

1st check point

• ignore options
• ignore counts
• simply read the files (or stdin) and output words

2nd check point

• parse options
• shift args (argc--, argv++)
• strtol
• show usage if invalid options

3rd check point

create a table of words

convert table to array

print array

4th check point

• sort array
• handle [-+]<n> and [-+]a options

5th check point

• create a table of characters
• create a table of lines
• handle -f option

6th check point

• test on big files, e.g., /usr/dict/words
• get rid of memory leaks, e.g., Table_free() frees the keys, but not the values