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find and delete empty directories recursively
this will show the names of the deleted directories, and will delete directories that only no files, only empty directories.

finds the c files with lines containing 'mcs', in the folders under the current folder

convert a line to a space

list files recursively by size

Bulk renames with find, sed and a little escaping
This command is a more flexible than my previous submission. It will work with spaces however suuuuper hacky and ugly. Source: http://www.unix.com/shell-programming-scripting/146173-find-rename-files-using-find-mv-sed.html

find the rpm package name that provides a specific file
For Linux distributions using rpm (eg Mandriva), this command will find the rpm package name that provides a file.

Get a process's pid by supplying its name

Calculates the number of physical cores considering HyperThreading in AWK
Check whether hyperthreading is enabled or not. a better solution as nproc should work on all OS with awk

keep an eye on system load changes
helps you keep watch on the load of a system, without having to stare constantly at the terminal. The -d argument to watch highlights the difference from the last run, making it easier to note how the load is fluctuating. The sed command just strips off the information about how long the box has been up, and how many users are logged in.

Get information about a video file


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