FAQ: Redirection - uniq

This community-built FAQ covers the “uniq” exercise from the lesson “Redirection”.

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This exercise can be found in the following Codecademy content:

Web Development

Learn the Command Line

FAQs on the exercise uniq

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Hello, how to replace the content of an existing file with duplicates by the content without duplicates?

For example: uniq file.txt > file.txt doesn’t work, the resulting file will be empty.

For the sort program, a solution is provided in https://stackoverflow.com/questions/29244351/how-to-sort-a-file-in-place_ : use sort -o file.txt file.txt

A common mistake is to try to redirect the output to the same input file (e.g. sort file > file). _ This does not work as the shell is making the redirections (not the sort program) and the input file (as being the output also) will be erased just before giving the sort program the opportunity of reading it.

For the the uniq program, I can’t identify a solution. Any clue?
Thanks.