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Old 06-20-2005
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> operator will create a new file (if the file exists, this operation will over write the contents of the file.

>> will append to an existing file.

In both cases, if the file does not already exist, it will be created.

cat file | grep "pattern" > my_new_file
ls -a | grep "pattern" >> my_new_file
grep "pattern" file > my_new_file