adb command to search the filesystem Is there an adb command similar to "locate" or "grep" that would help me find a file on my Android device? 

I'm curious about adb specifically, not a search app. 

EDIT: "find" has been suggested, but on my ICS device: 

hydrangea@turnsole:~$ adb shell find / -name *maps*
/system/bin/sh: find: not found


On my Gingerbread device it works, though. (Except I haven't rooted that device so it lacks permission.)

hydrangea@turnsole:~$ adb shell find / -name *maps*
find: permission denied
The find command works well in adb shell. The syntax is find /path -name file_name. For searching read only areas you will need root. If the find command is not available on your particular device, you might need to install BusyBox (search the Market.)

For example,
adb shell find / -name *maps*
will find all files that contain word "maps" across the entire file system.