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Full Discussion: Compare two arrays
Top Forums Shell Programming and Scripting Compare two arrays Post 302765843 by zaxxon on Sunday 3rd of February 2013 03:51:15 PM
Old 02-03-2013
Here is an example how you could cycle and compare array elements (example with integers) and print only those from array 1, which are not in array 2:
Code:
$ cat ./mach.ksh
#!/usr/bin/ksh

set -A ARR1 4 1 3 2
set -A ARR2 5 6 2 7 4 8

MAX=$((${#ARR2[*]}-1))

for a in ${ARR1[*]}; do
        COUNT=0
        set -A HITS
        for b in ${ARR2[*]}; do
                (( $a != $b )) && \
                HITS[$COUNT]=$a && \
                let COUNT+=1
        done
        (( ${#HITS[*]} != $MAX )) && \
        print ${HITS[0]}
        unset HITS
done

exit 0

$ ./mach.ksh
1
3

Somehow there is a blank line at the end. Didn't find where it comes from Smilie

Maybe other people have more efficient algorithm to do this which would be interessting for me too.

If you have 2 files with the lists of files you might want to compare, a grep -f file1 file2 or grep -vf file1 file2 might be more efficient than my example.
 

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VCF-COMPARE(1)							   User Commands						    VCF-COMPARE(1)

NAME
vcf-compare - compare bgzipped and tabix indexed VCF files SYNOPSIS
compare-vcf [OPTIONS] file1.vcf file2.vcf ... DESCRIPTION
About: Compare bgzipped and tabix indexed VCF files. (E.g. bgzip file.vcf; tabix -p vcf file.vcf.gz) OPTIONS
-c, --chromosomes <list|file> Same as -r, left for backward compatibility. Please do not use as it will be dropped in the future. -d, --debug Debugging information. Giving the option multiple times increases verbosity -H, --cmp-haplotypes Compare haplotypes, not only positions -m, --name-mapping <list|file> Use with -H when comparing files with differing column names. The argument to this options is a comma-separated list or one mapping per line in a file. The names are colon separated and must appear in the same order as the files on the command line. -R, --refseq <file> Compare the actual sequence, not just positions. Use with -w to compare indels. -r, --regions <list|file> Process the given regions (comma-separated list or one region per line in a file). -s, --samples <list> Process only the listed samples. Excluding unwanted samples may increase performance considerably. -w, --win <int> In repetitive sequences, the same indel can be called at different positions. Consider records this far apart as matching (be it a SNP or an indel). -h, -?, --help This help message. vcf-compare 0.1.5 July 2011 VCF-COMPARE(1)
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