Fail to change file mode on /etc/passwd with error "Permission denied"

Solution Verified - Updated -

Issue

  • chmod fails on files /etc/passwd and /etc/passwd- due to error "Permission denied".
# chmod 600 /etc/passwd
chmod: changing permissions of /etc/passwd: Permission denied
# chmod 600 /etc/passwd-
chmod: changing permissions of /etc/passwd-: Permission denied

Environment

  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux 9

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