PutAppend

expr >>> filename appends expr to a file.

PutAppend[, , ... , "filename"] appends a sequence of expressions to a file.

PutAppend works the same as Put, except that it adds output to the end of the file, rather than replacing the complete contents of the file.

See The Mathematica Book: Section 1.11.1 and Section 2.11.1.

See also: Write.

Further Examples