firstline()

Evaluates to True on the first line of the file. If the first line is blank and blanks are skipped firstline() never fires.

Optionally, takes a function argument that is evaluated if firstline() matches

Data signatures
firstline( [eval this: $${\color{green}None}$$ ǁ $${\color{green}Any}$$] )

Call signatures
firstline( [eval this: Function ǁ Equality] )

Purpose	Value
Main focus	firstline() determines if lines match
Aliases	firstline, first_line

Context	Qualifier
Match qualifiers	onmatch
Value qualifiers	onmatch

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