Diferença entre sobrescrever e adicionar conteúdo ao final do arquivo

gistfile1.txt

A little understanding of how *nix pipes work would help.

In short the '>>' pipe operator will append lines to the end of the specified file, where-as the single greater than '>' will empty and overwrite the file.

echo "text" > 'Users/Name/Desktop/TheAccount.txt'

FONTE: http://stackoverflow.com/questions/4676459/write-to-file-but-overwrite-it-if-it-exists