来自 linux 的各种日志中的该字符串“ÿôÿý”
有人知道为什么“ÿôÿý”字符串出现在Linux的各种日志中吗？我无法弄清楚。它不会每次都出现，但一旦出现就会使日志（例如 Oracle 备份日志）难以读取。 任何帮助/提示将不胜感激！
Anyone knows why the "ÿôÿý" string appears in various logs on Linux? I cannot figure it out. It does not appear every time, but when it does it makes the log (oracle backup log for example) difficult to read.
Any help/hint will be much appreciated!
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它看起来像一个 telnet 命令序列，旨在被某些通信软件解释为命令，但由于某种原因，它被作为普通字符传递，而不是被解释为 telnet 命令。
所有 telnet 命令都以字节 0xff 开头，后跟标识该命令的另一个字节。 0xff 在 ISO Latin-1 中将显示为 ÿ。 0xff 0xf4 (ÿô) 是一个 telnet 中断进程命令，它应该向进程发送一个 SIGINT 信号（如 ^C）。 0xff 0xfd (ÿý) 是 telnet DO 命令的开头，用于协商打开某些 telnet 选项；它后面应该跟着另一个字节来标识特定选项（尽管它可能是非打印控制字符）。
It looks like a telnet command sequence that was intended to be interpreted as a command by some communications software, but for some reason got passed through as ordinary characters rather than being interpreted as a telnet command.
All telnet commands start with the byte 0xff followed by another byte identifying the command. 0xff will display as ÿ in ISO Latin-1. 0xff 0xf4 (ÿô) is a telnet Interrupt Process command, which should send a SIGINT signal to the process (like ^C). 0xff 0xfd (ÿý) is the beginning of a telnet DO command, used to negotiate turning on some telnet option; it should be followed by another byte identifying the specific option (although it may be a non-printing control character).