Why sudoing twice shows unexpected values for USER, USERNAME and LOGNAME environment variables
Issue
-
When sudoing twice, USER, USERNAME and LOGNAME environment variables contain
rootinstead of the user we are logged in# sudo sudo -u testuser bash -c 'echo "LOGNAME=$LOGNAME; USER=$USER; USERNAME=$USERNAME"' LOGNAME=root; USER=root; USERNAME=root -
When sudoing only once, USER, USERNAME and LOGNAME environment variables contain the login of the user we are logged in
# sudo -u testuser bash -c 'echo "LOGNAME=$LOGNAME; USER=$USER; USERNAME=$USERNAME"' LOGNAME=testuser; USER=testuser; USERNAME=testuser
Environment
- Red Hat Enterprise Linux 7.5 and later
- sudo >= 1.8.19p2-10
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