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Apr 2, 2019
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Dec 27, 2019

anew

Append lines from stdin to a file, but only if they don't already appear in the file. Outputs new lines to stdout too, making it a bit like a tee -a that removes duplicates.

Usage Example

Here, a file called things.txt contains a list of numbers. newthings.txt contains a second list of numbers, some of which appear in things.txt and some of which do not. anew is used to append the latter to things.txt.

▶ cat things.txt
Zero
One
Two

▶ cat newthings.txt
One
Two
Three
Four

▶ cat newthings.txt | anew things.txt
Three
Four

▶ cat things.txt
Zero
One
Two
Three
Four

Note that the new lines added to things.txt are also sent to stdout, this allows for them to be redirected to another file:

▶ cat newthings.txt | anew things.txt > added-lines.txt
▶ cat added-lines.txt
Three
Four

Install

▶ go get -u github.com/tomnomnom/anew

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A tool for adding new lines to files, skipping duplicates

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