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lang-bash
C2ifC1fails, which violates the specification laid out in the question (namely, that only one of the commands is run).x && y || zis not equivalent toif x; then y; else z; fi.C1is a command which sometimes returns a non-zero exit code, you will end up executing bothC1andC2when that happens.((...))instead of[...]-- double parentheses are specifically for arithmetic expressions.$(())inside(())--(( RANDOM%2 == 0 ))