"The SORT utility, initially known as the Sort/Merge utility, in a crude sense is a mainframe program to sort records in a file into a specified order or copy selected records. SORT can also be used to merge pre-sorted files into a sorted file.
Mainframes were originally supplied with limited main memory by today's standards. The amount of data to be sorted was frequently very large.
Because of this, unlike more recent sort programs, early sort/merge programs placed great emphasis on efficient techniques for sorting data on
secondary storage, typically tape or disk. In 1968 the OS/360 Sort/Merge program provided five different "sequence distribution techniques" that
could be used depending on the number and type of devices available.
Sort/Merge is very frequently used; often the most commonly used application program in a mainframe shop."
There is more detailed explanation about SORT on the blog: http://mainframe-sort-tricks.blogspot.in/ .
PS. Shared the blog details after the permission from the blog owner.
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