[RHEL5] When execute ssh command, 'standard in must be a tty' error occurs

Solution Verified - Updated -

Issue

When executing ssh command, 'standard in must be a tty' error occurs

$ ssh test@<serverIP> su - root -c 'df'
test@<serverIP>'s password: 
standard in must be a tty

Environment

  • Red Hat Enterprise Linux 4
  • Red Hat Enterprise Linux 5

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