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As per the documentation, the par.txt file should contain the path to the individual segments. I don’t think you can use environment variables. https://code.kx.com/q4m3/14_Introduction_to_Kdb%2B/#144-segmented-tables
“<code style=”display: inline !important;”>par.txt
containing the paths of the physical locations of the segments, one segment path per line.”
code.kx.com
14. Introduction to Kdb+ - Q for Mortals
Q for Mortals: a textbook for kdb+ and the q programming language