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# Non recursive
# [1] rm specific file extension
find . -maxdepth 1 -name "*.pdf" -print0 | xargs -0 rm
# [2] chmod files
find . -maxdepth 1 -name "*.html" -print0 | xargs -0 chmod 777
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when ls gives : ls: Argument list too long : you may use
find ./ -name "file-*.pdb"