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== remove broken links ==
find -L . -type l -exec rm -rf {} \;
== how this work ==
"symbolic link; this is never true if the -L option or the -follow option is in effect, unless the symbolic link is broken. If you want to search for symbolic links when -L is in effect, use -xtype." -- manpage of find.
other options:
* replace md5sum with sha1sum for SHA1 checksum
* replace '>' with '| tar zx' for extracting tarball