Sqlplus login error when using bash variables SP2-0306 Invalid option

Question

I have a bash script that connects to an oracle 10g database.

In a first step it takes some variables from a "config" file with the following command

. /path/to/my/configfile.ini

In the config file there are some variables:

export USRID=myUser
export USRID_PASS=myPassword
export USR_PASS="$USRID/$USRID_PASS@myDatabase"

Then it actually connects through sqlplus using the command:

sqlplus -s $usr_pass

Terrible Security and Design issues aside (this script has been around for 5 years). This is actually doing its job in one of our UNIX servers, but not in another.

When I run the script with bash -x, I can see that the command expanded to:

sqlplus -s myUser/myPassword@myDatabase

...which should do fine (and is actually working in one server), but the response in the failing server is:

ERROR: ORA-01017: invalid username/password; logon denied

SP2-0306: Invalid option. Usage: CONN[ECT] [logon] [AS {SYSDBA|SYSOPER}] where ::= [/][@] | SP2-0306: Invalid option.

I'm guessing it has to do more with bash than with oracle, but I'm no bash expert. Is there some configuration or detail I'm missing?

EDIT:

Trying to pin down the problem a bit more, I'm now running two versions of the script in a third development server, and in different tests, the login works if i do it with:

sqlplus -s $usrid/$usrid_pass@myDatabase

but not when i try:

sqlplus -s $usr_pass

So its a bit annoying.

Besides that, i'll have to check on te config file synchronization process... I'll let you know when i get to something new. Thanks everybody.