head

Operator

  head — copy leading values of input sequence

Synopsis

head [ <const-expr> ]

Description

The head operator copies the first N values from its input to its output and ends the sequence thereafter. N is given by <const-expr>, a compile-time constant expression that evaluates to a positive integer. If <const-expr> is not provided, the value of N defaults to 1.

Examples

Grab first two values of arbitrary sequence

head 2

1
"foo"
[1,2,3]

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Grab first two values of arbitrary sequence, using a different representation of two

head 1+1

1
"foo"
[1,2,3]

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Grab the first record of a record sequence

echo '{a:"hello"}{b:"world"}' | super -z -c head -