User Guide : Using Content Extraction Language : Language Syntax and Examples : >=
 
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>=
as in "variable >= expression".
The greater than or equal ( >= ) comparison operator is used in comparison expressions. The expression returns true if var has a greater or equal value to exp after evaluation, false otherwise. The comparison is numeric unless both sides evaluate as strings. For more information, see Comparison Expressions.
Example
if ( length($0) >= 40) { column[0] = $0(1 40); column[1] = $0(41 80); }