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Detect duplicate UID in you /etc/passwd (or GID in /etc/group file).
Duplicate UID is often forbidden for it can be a security breach.
Useful for C projects where header file names must be unique (e.g. when using autoconf/automake), or when diagnosing if the wrong header file is being used (due to dupe file names)
Improvement of the command "Find Duplicate Files (based on size first, then MD5 hash)" when searching for duplicate files in a directory containing a subversion working copy. This way the (multiple dupicates) in the meta-information directories are ignored.
Can easily be adopted for other VCS as well. For CVS i.e. change ".svn" into ".csv":
find -type d -name ".csv" -prune -o -not -empty -type f -printf "%s\n" | sort -rn | uniq -d | xargs -I{} -n1 find -type d -name ".csv" -prune -o -type f -size {}c -print0 | xargs -0 md5sum | sort | uniq -w32 --all-repeated=separate
the f is for file and - stdout, This way little shorter.
I Like copy-directory function It does the job but looks like SH**, and this doesn't understand folders with whitespaces and can only handle full path, but otherwise fine,
function copy-directory () { ; FrDir="$(echo $1 | sed 's:/: :g' | awk '/ / {print $NF}')" ; SiZe="$(du -sb $1 | awk '{print $1}')" ; (cd $1 ; cd .. ; tar c $FrDir/ )|pv -s $SiZe|(cd $2 ; tar x ) ; }
Displays the duplicated lines in a file and their occuring frequency.