cat

Concatentate files.

How:

Go to ~/cat

cd ~/cat

• Merge two files into a new file (create if not exists, truncate if exists):

  cat ./chapter1 ./chapter2 > ./book

• Append a file into another one. (note the ">>"):

  cat ./chapter3 >> ./book

• Append a few lines into a file:

      cat << EOF >> ./book
      This is the end of the book.
      EOF

• Show file:

  cat ./book

      #########
      #  Chapter One
      #########
      
      %%%%%%%%%
      %  Chapter Two
      %%%%%%%%%
      
      *********
      *  Chapter Three
      *********
      
      This is the end of the book.