singleton.nf

#!/usr/bin/env nextflow
/*
 * Copyright 2013-2024, Seqera Labs
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

process foo {
  output:
  file x

  '''
  echo -n Hello > x
  '''
}

process bar {
  input:
  file x
  val y

  """
  cat $x
  echo $y
  """

}

workflow {
  foo()
  bar(foo.out, channel.of(1,2,3))
}