The 34 and 37 are the Bash escapecodes for specifying the colors blue and white, respectively.
和 37 是分别用于指定蓝色和白色的 Bash 转义代码。
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Some frameworks also provide a series of standardized key codes that represent keyboard-based events (such as hitting the Escape key, Return key, cursor keys, and so forth).
I put in the escape character as a set member, but a Stretch code for that did not appear in the 1960 survey [4] of internal computer character codes because the set was already frozen.