I don't know how Tivoli works, but you are writing to run a "job.sh" script, so I assume it is a shell script.
Normally when working with oracle it is a good idea to enter absolute paths, so your script could be
#!/bin/sh
$ORACLE_HOME=<your path of oracle installation>
$ORACLE_SID=<your instance name>
$PWD=<Position of your sql script>
..........
$ORACLE_HOME/bin/sqlplus login/password @$PWD/script.sql
I hope that's what you were looking for.
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