#! /usr/bin/env bash # # A diff canonifier that removes all fields starting with a given # prefix. if [ $# != 1 ]; then echo "usage: `basename $0` " exit 1 fi awk -v "PREFIX=$1" ' BEGIN { FS="\t"; OFS="\t"; } /^#fields/ { for ( i = 2; i <= NF; ++i ) { if ( index($i, PREFIX) == 1 ) rem[i-1] = 1; } print; next; } { for ( i in rem ) # Mark that it iss set, but ignore content. $i = "+"; print; } '