If you'd like to add text from one file to another (concatenate two text files) the run the following command:
cat file1 | cat >> file2
This will output the contents of file1 and pipe the output to file2.
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If you'd like to add text from one file to another (concatenate two text files) the run the following command:
cat file1 | cat >> file2
This will output the contents of file1 and pipe the output to file2.