child.sh

#!/bin/bash
set -euo pipefail

terminate(){
  printf "Terminating child process $$ after signal."
  exit 1
}

printf "Running $0, pid is %d, pgid is %d\n" "$$" "$(ps -o pgid= $$)"

trap 'echo "Got an INT signal"; terminate' INT
trap 'echo "Got a TERM signal"; terminate' TERM
trap 'echo "Got a QUIT signal"; terminate' QUIT
trap 'echo "Got a HUP signal"; terminate' HUP

pstree -p $$
sleep 100

parent.sh

#!/bin/bash
set -euo pipefail

terminate(){
  printf "Terminating parent process $$ after signal."
  exit 1
}

printf "Running $0, pid is %d, pgid is %d\n" "$$" "$(ps -o pgid= $$)"

trap 'echo "Got an INT signal"; terminate' INT
trap 'echo "Got a TERM signal"; terminate' TERM
trap 'echo "Got a QUIT signal"; terminate' QUIT
trap 'echo "Got a HUP signal"; terminate' HUP

bash ./child.sh

pipeline.yml

steps:
  - label: "Testing implicit shell"
    commands: 
      #- trap "kill -- -\$\$" TERM
      - chmod +x ./parent.sh
      - ./parent.sh
      - true

  - label: "Testing explicit shell"
    command: ./parent.sh