pam_exec and PAM_USER

[Sean Goller]

Hi,
                I need to execute a script each time a user logs in, and the script needs the username. I've tried any number of things to get the PAM_USER environment variable and it always turns up empty.  I'm using RHEL5, can anyone tell me which section (auth,account, etc) I should put pam_exec in, and how should be accessing it from the script? It's a bash script so I thought that $PAM_USER would be sufficient. But that never seems to work for me. :(

-S.
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