Unix tutorial 2

Displaying contents of files
  % less filename.txt - writes the contents of a file onto the screen a page at a time
                    - Press the [space-bar] if you want to see another page

  % head filename.txt - writes the first ten lines of a file to the screen.
  % head -5 filename.txt - write the first five lines. The number 5 can be changed to display the desired number of lines.

  % less filename.txt - displays the last 15 lines of a file

  % grep - Searches file for pattern or word
        usage ( % grep word_to_search filename.txt)
        % grep -i word_to_search filename.txt - the -i ignores the upper/lower case distinctions
        % grep -v word_to_search filename.txt - display those lines that do NOT match 
        % grep -n word_to_search filename.txt - precede each matching line with the line number 
        % grep -c word_to_search filename.txt - print only the total count of matched lines 
  % wc
        % wc -w filename.txt - count all the words
        % wc -c filename.txt - count all the characters
        % wc -l filename.txt - count all the line
        % wc  filename.txt - displays total lines, words and characters