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http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/6/html/6.1_Technical_Notes/at.html behaves as expected and does no longer cause echos of messages. behaves as expected and no longer echoes duplicate messages.
Also: PIE compile option for secure positions independently executable on targets. PIE compile option to specify secure Position-Independent Executables.
Fixed: http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/6/html/6.1_Technical_Notes/at.html#RHBA-2011-0016 Thanks for reporting, Martin