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Have a go with this:


#!/usr/bin/env ksh

awk -v date=${1:-nodate} '
/BEGIN:VEVENT/ { cache = 1; }

/LAST-MODIFIED:/ {
if( index( $0, date ) )
drop = 1;
...

The second case ($($0)) is using command substitution. The result of this would be to replace the command with the standard output of the command substitution (in this case itself ($0)), and so it...