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(-)a/misc/add_date_fields_to_marc_records.pl (-2 / +5 lines)
Lines 138-144 For instance: Link Here
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=item B<--unless-exists>
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=item B<--unless-exists>
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Will only create the new fields if this field does not exist
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Will only create the new fields if this field does not exist.
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For instance, if --field='905$a=0/%Y' and --unless-exists='905$a' are provided, a 905$a will be created unless there is already one.
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If --unless-exists is not passed, a new 905$a will be created in any case.
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=back
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=back
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