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output_field_separator HANDLE EXPR
$OUTPUT_FIELD_SEPARATOR
$OFS
$,

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output_field_separator HANDLE EXPR

$OUTPUT_FIELD_SEPARATOR

$OFS

The output field separator for the print operator. Ordinarily the print operator simply prints out the comma-separated fields you specify. To get behavior more like awk, set this variable as you would set awk's OFS variable to specify what is printed between fields. (Mnemonic: what is printed when there is a , in your print statement.)

Source: Perl predefined variables
Copyright: Larry Wall, et al.

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output_field_separator HANDLE EXPR $OUTPUT_FIELD_SEPARATOR $OFS $,

output_field_separator HANDLE EXPR
$OUTPUT_FIELD_SEPARATOR
$OFS
$,