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Top Forums UNIX for Dummies Questions & Answers A directory of common files from two others Post 302583525 by agama on Tuesday 20th of December 2011 03:09:56 PM
Old 12-20-2011
One way of doing it would be this:

Code:
if [[ -z $3 ]]
then
    echo "usage: $0 source-dir check-dir target-dir"
    exit 1
fi
# probably should also check to see if all three are directories and fail if not.

ls $1 $2 | awk -v sd="$1" -v td=$3 '{ c[$1]++; } END { for( x in c ) if( c[x] == 2 ) printf( "cp %s/%s %s/\n", sd, x, td ); }'

Supplies the target directory to the script as the third parameter and copies the files from the first (source) directory there if they are found in the check (second) directory. The output of the script is the copy commands which when verified can be piped to your shell of choice.
 

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dircmp(1)						      General Commands Manual							 dircmp(1)

NAME
dircmp - directory comparison SYNOPSIS
n] dir1 dir2 DESCRIPTION
examines dir1 and dir2 and generates various tabulated information about the contents of the directories. Sorted listings of files that are unique to each directory are generated for all the options. If no option is entered, a sorted list is output indicating whether the filenames common to both directories have the same contents. Compare the contents of files with the same name in both directories and output a list telling what must be changed in the two files to bring them into agreement. The list format is described in diff(1). Suppress messages about identical files. Change the width of the output line to n characters. The default width is 72. EXTERNAL INFLUENCES
Environment Variables LC_COLLATE determines the order in which the output is sorted. If is not specified in the environment or is set to the empty string, the value of is used as a default. If is not specified or is set to the empty string, a default of ``C'' (see lang(5)) is used instead of If any internationalization variable contains an invalid setting, behaves as if all internationalization variables are set to ``C'' (see environ(5)). International Code Set Support Single- and multi-byte character code sets are supported. EXAMPLES
Compare the two directories and and produce a list of changes that would make the directories identical: WARNINGS
This command is likely to be withdrawn from X/Open standards. Applications using this command might not be portable to other vendors' sys- tems. As an alternative is recommended. SEE ALSO
cmp(1), diff(1). STANDARDS CONFORMANCE
dircmp(1)
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