`su postgres -c "psql -c 'drop table users'"` resolved to `su`, so the
SQL-client check never saw psql. The value of su's -c/--command (or of a
short-option cluster ending in c, as in -lc) is now scanned as a command
line of its own, like the value of sh -c. The scan continues past `--`,
since su hands the arguments after it to the target shell, which runs a
-c there too.
taskset joins the runners: its -c is a flag and the CPU mask is one
positional, so `taskset -c 0 psql ...` resolves to psql.
L4XB
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