According to the in game help when typing out commands we should be able to:
press 'tab' to autocomplete a command or it's arguments
press 'up' to bring up the last command/text input
See Attached Screenshot
I have tested this with the on screen keyboard (Samsung Tablet) and with an external Bluetooth Keyboard also.
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Closed as a Duplicate of MCPE-10353.
It has been linked to this report.
Also, the 'tab to complete' feature is not planned to be added to the touch screen keyboard functions.
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Confirmed on Samsung Galaxy S6 (SM-G920W8), Android 6.0.1 using Swiftkey Keyboard 6.4.1.52. Samsung default keyboard does not have a tab key.
Pressing tab when using the Swiftkey Keyboard produces a small o with macron (a small o with a bar above it).
Pressing arrow keys with Swiftkey Keyboard had no effect.