The problem is that for bash `true` is a function (or builtin) that returns 0, while for C (and thus most languages) any non-zero value (typically 1 for the bui

The problem is that for bash `true` is a function (or builtin) that returns 0, while for C (and thus most languages) any non-zero value (typically 1 for the builtins) is true. In c99 and later with stdbool.h, `true` is almost always defined as `#define true 1`.