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List your MACs address

Show DeviceMapper names for LVM Volumes (to disambiguate iostat logs, etc)
Emits the device names which will be printed by iostat for an LVM volume; doesn't show the names for the underlying devices when snapshots are being used (the -cow and -real devices in /dev/mapper)

no more line wrapping in your terminal
works on all unices.

Recursive Ownership Change
Changing files ownership in a directory recursivley from a user to another

Remount an already-mounted filesystem without unmounting it
Necessary for fsck for example. The remount functionality follows the standard way how the mount command works with options from fstab. It means the mount command doesn't read fstab (or mtab) only when a device and dir are fully specified. After this call all old mount options are replaced and arbitrary stuff from fstab is ignored, except the loop= option which is internally generated and maintained by the mount command. It does not change device or mount point.

'micro' ps aux (by mem/cpu)
mac os x: ps aux | awk '{print($1" "$3" "$4" "$11);}' | grep -v "0,0" linux: ps aux | awk '{print($1" "$3" "$4" "$11);}' | grep -v "0.0"

check open ports without netstat or lsof

See system users

count files by type
displays a list of all file extensions in current directory and how many files there are of each type of extension in ascending order (case insensitive)

copy audio file from playlist to a floder
copy some file from xx.m3u to target folder


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