Does nothing, no errors.

[xged]

Cannot see any effect by correctly executing commands (sendkey.sh, sendkeys.sh, xsendkey). #Unity

[kyoto]

Confirmed that xsendkey (and therefore sendkey.sh and sendkeys.sh) is not working with recent versions of Unity.

[baykovr]

Cinnamon 2.6.13, able to send keys to current window (removing -windows flag) but not others.