ADB (android debug bridge) is command line utility available in Android SDK to manage the emulators. Below are all the commands - 
Android Debug Bridge version 1.0.20
 -d - directs command
to the only connected USB device                               returns an
error if more than one USB device is present.
 -e - directs command
to the only runing emulator.                                 returns an error if
more than one emulator is running.
 -s  - directs command
to the USB device or emulator with
the given
serial number
 -p - simple product name
like 'sooner', or 
a
relative/absolute path to a product out directory
like 'out/target/product/sooner'.If -p is not
specified, the ANDROID_PRODUCT_OUT environment
variable is used, which must                                  be an absolute
path.
 devices - list all connected
devices
device commands:
adb push
  - copy
file/dir to device
  adb pull
 - copy
file/dir from device
  adb sync [
 ]- copy
host->device only if changed
                                 (see 'adb help
all')
adb shell - run remote shell interactively
  adb shell
- run remote
shell command
  adb emu
  - run emulator
console command
  adb logcat [
 ] - View device log
  adb forward
  - forward socket connections
                                 forward specs
are one of:tcp: 
                                  
localabstract:
                                  
localreserved:
                                  
localfilesystem:
                                  
dev:
adb jdwp - list PIDs of processeshosting a JDWP transport
adb install [-l]
[-r]  - push this package file to the device and install it
                                 ('-l' means
forward-lock the app)
                                 ('-r' means
reinstall the app, keeping its data)
adb uninstall [-k]
 - remove this app package from the device 
                                 ('-k' means
keep the data and cache directories)
  adb bugreport                - return all information from
the device
                                 that should be included in a bug
report.
  adb help                     - show this help message
  adb version                  - show version num
DATAOPTS:
 (no option)                   - don't touch the data
partition
  -w                           - wipe the data partition
  -d                           - flash the data
partition
scripting:
  adb
wait-for-device          - block until
device is online
  adb
start-server             - ensure that
there is a server running
  adb kill-server              - kill the server if it is
running
  adb get-state                - prints: offline | bootloader
| device
  adb get-product              - prints:  
  adb
get-serialno             - prints:
  adb status-window            - continuously print device status
for a specified device
  adb remount                  - remounts the /system
partition on the device read-write
networking:
  adb ppp 
[parameters]   - Run PPP over USB.
 Note: you should not automatically
start a PDP connection.
  refers to
the tty for PPP stream. Eg. dev:/dev/omap_csmi_tty1
 [parameters] - Eg.
defaultroute debug dump local notty usepeerdns
adb sync notes: adb sync [  ]
   can
be interpreted in several ways:
  - If
 is not specified, both /system and /data partitions will be
updated.
  - If it is
"system" or "data", only the corresponding partition
    is updated