$ ccwl compile checksum.scm > checksum.cwl
$ cwltool checksum.cwl --file hello.txt
[workflow ] start
[workflow ] starting step sha256sum
[step sha256sum] start
[job sha256sum] /tmp/rjbcjppq$ sha256sum \
    /tmp/pc2bbl6o/stg2f7cdda0-9d89-47b7-96b6-fa377cc61c49/hello.txt > /tmp/rjbcjppq/0d2eaa5619c14b43326101200d0f27b0d8a1a4b1
[job sha256sum] completed success
[step sha256sum] completed success
[workflow ] starting step sha1sum
[step sha1sum] start
[job sha1sum] /tmp/1cjtot5q$ sha1sum \
    /tmp/wliybbsp/stg993b2838-c803-4527-89d6-6a0cd7a0587a/hello.txt > /tmp/1cjtot5q/d2f19c786fcd3feb329004c8747803fba581a02d
[job sha1sum] completed success
[step sha1sum] completed success
[workflow ] starting step md5sum
[step md5sum] start
[job md5sum] /tmp/z7fe89c7$ md5sum \
    /tmp/41nnygw9/stgebdc428b-ec84-4283-88ae-682c7f4628ac/hello.txt > /tmp/z7fe89c7/112be1054505027982e64d56b0879049c12737c6
[job md5sum] completed success
[step md5sum] completed success
[workflow ] completed success
{
    "md5": {
        "location": "file:///home/manimekalai/112be1054505027982e64d56b0879049c12737c6",
        "basename": "112be1054505027982e64d56b0879049c12737c6",
        "class": "File",
        "checksum": "sha1$dd2e54f3bd22a8bb4ffbf543151050ee9645baf2",
        "size": 98,
        "path": "/home/manimekalai/112be1054505027982e64d56b0879049c12737c6"
    },
    "sha1": {
        "location": "file:///home/manimekalai/d2f19c786fcd3feb329004c8747803fba581a02d",
        "basename": "d2f19c786fcd3feb329004c8747803fba581a02d",
        "class": "File",
        "checksum": "sha1$f4112d33f41bc98a114b35759c26eec9a9f4256c",
        "size": 106,
        "path": "/home/manimekalai/d2f19c786fcd3feb329004c8747803fba581a02d"
    },
    "sha256": {
        "location": "file:///home/manimekalai/0d2eaa5619c14b43326101200d0f27b0d8a1a4b1",
        "basename": "0d2eaa5619c14b43326101200d0f27b0d8a1a4b1",
        "class": "File",
        "checksum": "sha1$868ce04a610122b1c1f2846e5e9f9fc7a289d120",
        "size": 130,
        "path": "/home/manimekalai/0d2eaa5619c14b43326101200d0f27b0d8a1a4b1"
    }
}
Final process status is success