write_map

File write_map(Map[String, String])

Writes a tab-separated value (TSV) file with one line for each element in a Map[String, String]. Each element is concatenated into a single tab-delimited string of the format ~{key}\t~{value}. Each line is terminated by the newline (\n) character. If the Map is empty, an empty file is written.

Since Maps are ordered, the order of the lines in the file is guaranteed to be the same order that the elements were added to the Map.

Parameters

1. Map[String, String]: A Map, where each element will be a row in the generated file.

Returns: A File.

Example: write_map_task.wdl

version 1.3

task write_map {
  input {
    Map[String, String] map = {"key1": "value1", "key2": "value2"}
  }

  command <<<
    cut -f 1 ~{write_map(map)}
  >>>

  output {
    Array[String] keys = read_lines(stdout())
  }

  requirements {
    container: "ubuntu:latest"
  }
}

{}

{
  "write_map.keys": ["key1", "key2"]
}

The actual command line might look like:

cut -f 1 /local/fs/tmp/map.tsv

And /local/fs/tmp/map.tsv would contain:

key1\tvalue1
key2\tvalue2