File: diff-remove-uids

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#! /usr/bin/env bash
#
# A diff canonifier that removes all connection UIDs.

awk '
BEGIN { FS="\t"; OFS="\t"; }

/^[^#]/ {
    if ( column > 0 ) {
        $column = "XXXXXXXXXXX";
    }
}

/^#fields/ {
    for ( i = 2; i <= NF; ++i ) {
        if ( $i == "uid" )
            column = i - 1;
        }
    }

{ print }
'