Technical data

System Dump Analyzer
REPEAT
REPEAT
Repeats execution of the last command issued. On terminal devices, the KP0 key
performs the same function as the REPEAT command.
Format
REPEAT
Parameters
None.
Qualifiers
None.
Description
The REPEAT command is useful for stepping through a linked list of data
structures or for examining a sequence of memory locations.
Examples
1.
SDA> FORMAT @IOC$GL_DEVLIST
8000B540 DDB$L_LINK 8000B898
8000B544 DDB$L_UCB 8000B5E0
8000B548 DDB$W_SIZE 0044
.
.
.
8000B554 DDB$B_NAME_LEN 03
DDB$T_NAME "OPA"
.
.
.
SDA> FORMAT @.
8000B898 DDB$L_LINK 8000BBE0
8000B89C DDB$L_UCB 8000B9E0
8000B8A0 DDB$W_SIZE 0044
.
.
.
8000B8AC DDB$B_NAME_LEN 03
DDB$T_NAME "MBA"
SDA>
KP0
8000BBE0 DDB$L_LINK 807F85C0
8000BBE4 DDB$L_UCB 8000BC80
8000BBE8 DDB$W_SIZE 0044
.
.
.)
8000BBF4 DDB$B_NAME_LEN 03
DDB$T_NAME "NLA"
This series of FORMAT commands pursues the chain of device data blocks
(DDBs) from the system global symbol IOC$GL_DEVLIST. The second FORMAT
command is constructed so that it refers to the contents of the address at the
current location (see Section 7.2.4 for a discussion of SDA symbols). Subsequently,
SDA–67