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random scraps and notes that are useful to me
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git clone https://git.viktor1993.net/scraps.git
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compare_single_columns.awk (342B)

#!/usr/bin/awk
#USAGE: awk -f compare_single_columns.awk <file1> <file2>
BEGIN{
    print "Only in "ARGV[2]":";
}
(NR==FNR) {
    a[$0]++;next
}
{
    if($0 in a) {
        a[$0]="-1"
    } else {
        print $0
    }
}

END{
    print "Only in "ARGV[1]":";
    for(x in a) {
        if(a[x]!="-1") {
            print x;
        }
    }
}