When running the client programs scp2 and sftp2 in JCL, local datasets can be allocated by using DD cards.
The following sftp2 commands cannot be used with DD names:
rm (remove file)
Empty datasets cannot be read when referred to by DD names.
For the DD cards to work, BPXBATSL must be used instead of BPXBATCH. BPXBATSL uses local spawn and forces scp2 and sftp2 to run in the original address space where the DD information can be used.
For the local spawn to work, the address space must have enough memory and the environment variable _BPX_SHAREAS must not have the value NO. The value MUST causes BPXBATSL to fail if it cannot do a local spawn.
When using DD cards for defining dataset names, the environment variable _BPX_SHAREAS=MUST must be set in the dataset where the environment variables are defined (STDENV for example) and the region size must be sufficient (REGION=6M, for example).