02-04-2013
citroen is correct: the error doesn't come from "su" but from the login process of the user. Possible candidates are: the file "~/.profile" and the file "~/.cshrc".
The difference between "su - user" and "su user" is that "su - user" sets the complete environment for the new user you switch to while "su user" just changes the "effective user ID" and not the environment. If userA does a "su - userB" the session will still have the environment of "userA", but all the privileges of "userB".
I hope this helps.
bakunin
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LEARN ABOUT HPUX
setreuid
setreuid(2) System Calls Manual setreuid(2)
NAME
setreuid - set real and effective user IDs
SYNOPSIS
DESCRIPTION
The function sets the real and effective user IDs of the current process to the values specified by the ruid and euid arguments. If ruid or
euid is -1, the corresponding effective or real user ID of the current process is left unchanged.
A process with appropriate privileges can set either ID to any value. An unprivileged process can only set the effective user ID if the
euid argument is equal to either the real, effective, or saved user ID of the process.
It is unspecified whether a process without appropriate privileges is permitted to change the real user ID to match the current real,
effective or saved user ID of the process.
RETURN VALUE
Upon successful completion, 0 is returned. Otherwise, -1 is returned and is set to indicate the error.
ERRORS
The function will fail if:
[EINVAL] The value of the ruid or euid argument is invalid or out-of-range.
[EPERM] The current process does not have appropriate privileges, and either an attempt was made to change the
effective user ID to a value other than the real user ID or the saved set-user-ID or an attempt was made to
change the real user ID to a value not permitted by the implementation.
SEE ALSO
getuid(2), setuid(2), <unistd.h>.
CHANGE HISTORY
First released in Issue 4, Version 2.
setreuid(2)