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$ adb --help -s SERIAL use device with given serial (overrides $ANDROID_SERIAL) $ adb devices List of devices attached emulator-5554 device 7f1c864e device $ adb shell -s 7f1c864e error: more than one device and emulator 
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If there\'s only one emulator running or only one device connected, the adb command is sent to that device by default. If multiple emulators are running and/or multiple devices are attached, you need to use the -d, -e, or -s option to specify the target device to which the command should be directed.
But, in order to execute several commands in one line, you may use adb shell "cmd1;cmd2;cmd3" . The && command mentioned by @Rachit is not quite right, because in the case adb shell "netcfg && ps && getprop" , command ps will be executed only when netcfg is executed without error raised.
Use the -s option BEFORE the command to specify the device, for example:
adb -s 7f1c864e shell See also http://developer.android.com/tools/help/adb.html#directingcommands
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