Redirecting output to append to a file

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When the notation >> filename is added to the end of a command, the output of the command is appended to the specified file name, rather than writing over any existing data. The >> symbol is known as the append redirection operator.

For example, to append file2 to file1, type the following:

cat file2 >> file1

Note: If the file1 file does not exist, it is created, unless the noclobber option of the set built-in ksh (Korn shell) or csh (C shell) command is specified.