in

gistfile1.txt

jobs:
  - name: dashboard-build 
    serial: true
    plan:
      - get: dashboard.git
      - do:
        - task: a 
          privileged: true
          config:
            platform: linux
            run:
              path: /bin/sh
              args: 
                - -c 
                - "pwd && ls && ls / && echo hi > hase && echo ha > /hase"
        - task: b 
          privileged: true
          config:
            platform: linux
            run:
              path: /bin/sh
              args: 
                - -c 
                - "pwd && ls && ls / && cat hase; cat /hase"

out

ref
60976be867835b0a0c2698123f1ce148edcd1645
dashboard.git
a
/tmp/build/src
bin      etc      lib      linuxrc  mnt      proc     run      sys      usr
dev      home     lib64    media    opt      root     sbin     tmp      var

b
/tmp/build/src
bin      etc      lib      linuxrc  mnt      proc     run      sys      usr
dev      home     lib64    media    opt      root     sbin     tmp      var
cat: can't open 'hase': No such file or directory
cat: can't open '/hase': No such file or directory