anewer appends lines from stdin to a file if they don't already exist in the file. You could also use it as uniq without sort. This is a rust version of tomnomnom/anew. It makes use of tkaitchuck/aHash to cut down runtime to ~50%. Since only hashed lines are held in memory, it cuts down memory usage for inputs with long lines. Which is similar how huniq works.
``` $ anewer USAGE: anewer [FLAGS] [filename]
FLAGS: -n, --dry-run Dry run, will leave the file as it is -h, --help Prints help information -q, --quiet Quiet, won't print to stdout -V, --version Prints version information
ARGS:
cargo install anewer
``` $ cat things.txt Zero One Two
$ cat newthings.txt One Two Three Four
$ cat newthings.txt | anewer things.txt Three Four
$ cat things.txt Zero One Two Three Four ```
``` $ cat list.txt One One Two Two Three Four Three Four
$ cat list.txt | anewer One Two Three Four ```
GPLv3+