IBM Informix Dynamic Server (IDS) requires the existence of the informix user.

1 INFORMIXDIR

The INFORMIXDIR environment variable contains the path of the informix user.

Check the value:

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echo $INFORMIXDIR

If the recult is /home/informix implies that the informix user already exists.

Otherwise, you have to create it

2 Create the informix user

As root user create the informix user group:

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groupadd informix

And then create the informix user:

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useradd -c "IBM IDS" -g informix informix