01-26-2018
First, let me point out that I've edited my opening post, to add reference line numbers to all 'code' blocks. Herein I use the term 'code block' to refer to any section of my posts that are set off as 'code', regardless of whether it is actual script code, or other type of output taken from the shell session.
In the posted script, line 71 (the 'ps' command) should echo to stdout exactly what is being tested with the IF at line 73. The expected output for everything except the first iteration is shown in the last 'code' block in my opening post. For example, on the second iteration of the DO loop, the value of ORACLE_SID is 'fs91upg'. And we see this in the second code block, at line 8, as echoed from line 70 of the script. But we do not see any output from script line 71. That same command - line 71 of the script - produces the output shown at line 5 of the third 'code' block.
Of course, the fact that script line 71 never produces any output explains why the IF on line 73 is evaluating FALSE. So the question is not really about the IF, per se, but why that 'ps' command (both at script lines 71 and 73 is returning nulls when the very same command, with the very same values, returns expected data when issued from the command prompt.
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