This is more general than Rexx, so, IBM-MAIN:
I've submitted an RCF on this, but I'm still curious:
In: z/OS 2.2.0
z/OS TSO/E
z/OS TSO/E REXX Reference
TSO/E REXX commands
EXECIO
14. Example of reading a member of a RECFM=U file and changing the first
occurrence
of the word 'TSOREXX ' within each record to 'TSOEREXX' before rewriting
the record.
Contains a couple unterminated comments and a logic error:
It doesn't do what it says; it truncates the record at the target position
rather than
replacing. But when I fix that error, I find, for both RECFM=U and RECFM=VB:
o A replacing string longer than the replaced string results in an I/O error.
I guess that's to be expected.
o It's OK for the replacing string to be the same length as the replaced
string, or shorter.
The "shorter" case intrigues me. Does it shuffle the remaining records in
the block and write a shorter block? Is this done by the Rexx function
library or by QSAM? And how does it fill in the longer inter-block gap
without either overwriting the next block or leaving residual data? Does
it rewrite all remaining blocks in the track then do a formatting write to
the end-of-track?
-- gil
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