User Guide : Using Content Extraction Language : Language Syntax and Examples : NF
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The NF built-in variable is a special variable that contains the number of input fields. If IFS is defined, the input line is split using the IFS built-in variable and the number of input fields found is set in the NF built-in variable. NF should not be changed by the user.
NF <= 3 { REJECT; } #
Reject all lines with less than 4 fields