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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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XZDIFF(1)							     XZ Utils								 XZDIFF(1)

NAME
xzcmp, xzdiff, lzcmp, lzdiff - compare compressed files SYNOPSIS
xzcmp [cmp_options] file1 [file2] xzdiff [diff_options] file1 [file2] lzcmp [cmp_options] file1 [file2] lzdiff [diff_options] file1 [file2] DESCRIPTION
xzcmp and xzdiff invoke cmp(1) or diff(1) on files compressed with xz(1), lzma(1), gzip(1), bzip2(1), or lzop(1). All options specified are passed directly to cmp(1) or diff(1). If only one file is specified, then the files compared are file1 (which must have a suffix of a supported compression format) and file1 from which the compression format suffix has been stripped. If two files are specified, then they are uncompressed if necessary and fed to cmp(1) or diff(1). The exit status from cmp(1) or diff(1) is preserved. The names lzcmp and lzdiff are provided for backward compatibility with LZMA Utils. SEE ALSO
cmp(1), diff(1), xz(1), gzip(1), bzip2(1), lzop(1), zdiff(1) BUGS
Messages from the cmp(1) or diff(1) programs refer to temporary filenames instead of those specified. Tukaani 2011-03-19 XZDIFF(1)
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