key: Specifying the control record key

Explanation: key is the required positional parameter specifying the control record key for the control data set record you want to fix or display. The key can be specified in EBCDIC or hexadecimal characters.

Note:

Record types E, F, G, H, I, J, L, M, N, O, P, Q, R, S, T, U, V, W, X, Y, Z, and 1 have a 1-byte hexadecimal identification as an internal first byte. Do not include the 1-byte hexadecimal identification in the key field.
For deletion of an L record, specify the user’s data set name instead of the key.

The following are keys for types A, B, C, and D records:

Record Type	Key
A	Migrated data set name (non-VSAM) created when DFSMShsm migrates the data set or the name of a VSAM component of a migrated data set eligible for automatic recall.
B	Data set name of a user data set.
C	Backup version data set name created when DFSMShsm backs up the data set.
D	Data set name of a user data set.