shell/caucase.sh: Make shellcheck happy.
Do not rely on test's -a & -o. Escape backslashes which are intended as literals. Avoid one useless "cat". Avoid testing $?. Simplify "is integer ?" test. Quote a few variable expansions. Arithmetic expression does not need explicit expansion. Split declaration and assignment to unmask status. Disable shellcheck warning about "local" being undefined in POSIX.
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