A couple of thoughts:
The cutting up of input stream as you describe can be much done much easier with sed, for instance, instead of
query-students | sort | unhead '^D' | untail '^G'
query-students | sort | sed '/^D/,/^G/p; d'
Also, neither head
modify files they operate on. I understand, you were probably solving a specific problem, but this script can be generalized even more.
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