Logical search lists
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A logical search list is a type of logical name that has several equivalence strings. When a logical search list is used in a command like DIRECTORY, the system searches in the locations specified by all equivalence strings; when it is used in a command like CREATE, the object is created at the first available location. In the following example, a logical search list SUB is defined for two directories, SUB and SUB1:
SMAN43$ define sub dsa1:[jdoe.sub],dsa1:[jdoe.sub1] SMAN43$ dir sub Directory DSA1:[JDOE.SUB] ORIGINAL.LIS;1 SUB2.DIR;1 Total of 2 files. Directory DSA1:[JDOE.SUB1] A.COM;3 A.COM;2 A.COM;1 A.LIS;2 Total of 4 files. Grand total of 2 directories, 6 files. SMAN43$ create sub:b.lis test Exit SMAN43$ dir sub Directory DSA1:[JDOE.SUB] B.LIS;1 ORIGINAL.LIS;1 SUB2.DIR;1 Total of 3 files. Directory DSA1:[JDOE.SUB1] A.COM;3 A.COM;2 A.COM;1 A.LIS;2 Total of 4 files. Grand total of 2 directories, 7 files.
Many default logicals like SYS$SYSTEM and SYS$MANAGER are logical search lists pointing to both the system-specific and the clusterwide version of that directory.