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Category Archives: One-liners

Recursive chmod distinguishing files from folders

by Valeriu PaloƟ on December 16, 2009

Version 3 An even better method is: find “$target” -type f -exec chmod -c “$mode_files” {} \; \ -or -type d -exec chmod -c “$mode_dir” {} \; A true one-liner! 😀 Version 2 A better method is this: find “$target” -type f -exec chmod -c “$mode_files” {} \; find “$target” -type d -exec chmod -c […]

Recursive file/directory change-detection

by Valeriu PaloƟ on November 6, 2009

Disclaimer This article explores a way in which an approximate “fingerprint” of a file tree can be created! If all you want is to detect file changes a much more appropriate method would be to use inotify/incron. Version 2 (update) Another, much faster method would be to use ls -lR to browse over the filesystem. […]

Detect number of CPUs on a machine

by Valeriu PaloƟ on November 6, 2009

UPDATE: Steven pointed out (very nicely) that there’s no need for cat in this picture, grep would do just fine on its own. So, thanks Steven! Detect how many CPU cores are present on the running machine: grep -c processor /proc/cpuinfo This can be very useful when writing multi-threaded programs to properly match the number […]