anew

A tool for adding new lines to files written in Rust.

The tool aids in appending 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.

Install

Via cargo install

cargo install anew

Manual installation

git clone https://github.com/zer0yu/anew
cd anew
cargo build

or you can download the binary from releases

Usage

❯ anew --help
A tool for adding new lines to files, skipping duplicates

Usage: anew [OPTIONS] <FILEPATH>

Arguments:
  <FILEPATH>  Destination file

Options:
  -q, --quiet-mode  Do not output new lines to stdout
  -s, --sort        Sort lines (natsort)
  -t, --trim        Trim whitespaces
  -r, --rewrite     Rewrite existing destination file to remove duplicates
  -d, --dry-run     Do not write to file, only output what would be written
  -h, --help        Print help
  -V, --version     Print version

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.

Usage 1: Add differences to things.txt

❯ cat things.txt
One
Zero
Two
One

❯ cat newthings.txt
Three
One
Five
Two
Four

❯ cat newthings.txt | anew things.txt
Three
Five
Four

❯ cat things.txt
One
Zero
Two
One
Three
Five
Four

Usage 2: Disable terminal output

❯ cat newthings.txt | anew things.txt -q
Three
Five
Four

Usage 3: Sorting the contents of things.txt after adding new differences

❯ cat newthings.txt | ./anew things.txt -q -s

❯ cat things.txt
Five
Four
One
Three
Two
Zero

PS:

1. anew uses the fastest sorting algorithm, so don't worry about efficiency.
2. Sort mode automatically de-duplicates, so -s and -r do not need to be used at the same time.

Usage 4: De-duplication of things.txt after adding new differences

❯ cat newthings.txt | ./anew things.txt -q -r

❯ cat things.txt
One
Zero
Two
Three
Five
Four

Usage 5: Merge multiple files and remove duplicates (like sort -u)

❯ cat things.txt
One
Zero
Two

❯ cat newthings.txt
Three
One
Five

❯ cat morethings.txt
Four
One
Two

❯ cat *.txt | anew -u 
Five
Four
One
Three
Two
Zero

Note: The -u option automatically sorts the output and removes duplicates from all input files.

Efficiency Comparison

We use two files newoutput.txt and output.txt of size 10MB as input to the program to compare the difference in speed between tomnomnom's Go implementation, rwese's Rust implementation, and this project's Rust implementation.

This project

❯ time cat newoutput.txt | ./anew output.txt -q
cat newoutput.txt  0.00s user 0.02s system 1% cpu 1.398 total
./anew output.txt -q  1.46s user 0.22s system 97% cpu 1.717 total

anew implemented by rwese

❯ time cat newoutput.txt | ./anew_rwese output.txt -q
cat newoutput.txt  0.00s user 0.02s system 0% cpu 2:28.38 total
./anew output.txt -q  6.95s user 101.08s system 72% cpu 2:29.49 total

anew implemented by tomnomnom

❯ time cat newoutput.txt | ./anew_go -q output.txt
cat newoutput.txt  0.00s user 0.02s system 0% cpu 4.797 total
./anew_go -q output.txt  2.11s user 3.14s system 108% cpu 4.838 total

As can be seen from the above, the project has been implemented most efficiently!

References

1. anew@tomnomnom
2. anew@rwese