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Moving files and folders into hashed subfolders

· Performance Zone

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The following will move a series of files into subfolders. It hashes the file names, building a two character, two folder deep hierarchy to split the files, e.g. a1/b2. The motivation for this is to split 500,000 folders into a manageable hierarchy, to avoid file system limits – in NTFS this is quite slow, and well over the 64,000 limit in ext4.

vi f
for f in `ls pacer/`; do echo -n $f | md5sum | sed 's`\(..\)\(..\).*`\1/\2/`' | tr -d '\n'; echo $f; done;
./f > t
mkdir ../pacer2
./t | sed 's`\(..\)/\(..\)/\(.*\)`mkdir pacer2/\1\nmkdir pacer2/\1/\2\nmv pacer/\3 pacer2/\1/\2/\3`' > dirs
./dirs




The Performance Zone is brought to you in partnership with AppDynamics.  See Gartner’s latest research on the application performance monitoring landscape and how APM suites are becoming more and more critical to the business.

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