使用 xargs 将输入文件参数重定向到 bash 命令

Question

我有一个 python 命令（我无法修改），它将文件作为输入并输出结果：

  $ echo '{"sentence": "Did Uriah honestly think he could beat The Legend of Zelda in under three hours?"}' > examples.jsonl
  $ python -m allennlp.run predict https://s3-us-west-2.amazonaws.com/allennlp/models/ner-model-2018.02.12.tar.gz examples.jsonl

用法如下：

usage: python -m allennlp.run [command] predict [-h]
                                                [--output-file OUTPUT_FILE]
                                                [--weights-file WEIGHTS_FILE]
                                                [--batch-size BATCH_SIZE]
                                                [--silent]
                                                [--cuda-device CUDA_DEVICE]
                                                [-o OVERRIDES]
                                                [--include-package INCLUDE_PACKAGE]
                                                [--predictor PREDICTOR]
                                                archive_file input_file

bash 中是否有办法将输入直接重定向到此命令，而不是回显到文件？顺便说一句，该命令似乎不支持来自标准输入的pipe，因此以下将不起作用：

$ echo '{"sentence": "Did Uriah honestly think he could beat The Legend of Zelda in under three hours?"}' | python -m allennlp.run predict https://s3-us-west-2.amazonaws.com/allennlp/models/ner-model-2018.02.12.tar.gz

我尝试过使用xargs，但我不知道处理input_file 参数的正确方法

Answer 1

创建一个临时文件描述符，该描述符在命令退出时被释放。它适用于大多数程序并替换文件的参数。

<(echo hello)

例子

grep h <(echo hello)


python -m allennlp.run predict https://s3-us-west-2.amazonaws.com/allennlp/models/ner-model-2018.02.12.tar.gz  <( echo '{"sentence": "Did Uriah honestly think he could beat The Legend of Zelda in under three hours?"}' > examples.jsonl )

Answer 2

如果allennlp 需要一个文件（即不能简单地从 /dev/stdin 读取），那么这将起作用：

echo '{"sentence": "Did Uriah honestly think he could beat The Legend of Zelda in under three hours?"}' | 
  parallel --pipe -N1 --cat python -m allennlp.run predict https://s3-us-west-2.amazonaws.com/allennlp/models/ner-model-2018.02.12.tar.gz {}

如果您要使用不同的输入运行多个allennlp，它特别有用：

(echo '{"sentence": "Did Uriah honestly think he could beat The Legend of Zelda in under three hours?"}';
 echo '{"sentence": "its insatiable appetite is tempered by its fear of light."}';
 echo '{"sentence": "You were eaten by a grue"}';) |
  parallel --pipe -N1 --cat python -m allennlp.run predict https://s3-us-west-2.amazonaws.com/allennlp/models/ner-model-2018.02.12.tar.gz {}