autoTelnet within Linux

最新推荐文章于 2025-12-12 11:13:55 发布

转载最新推荐文章于 2025-12-12 11:13:55 发布 · 78 阅读

文章标签：

#数据库 #shell

本文介绍了在Linux环境中使用Telnet实现自动登录的方法，并演示了如何通过xargs工具来逐行处理输入流参数，避免默认的一次性处理所有参数的问题。

1, auto Telnet in linux

assumption:

host : localhost

user/passwd : oracle/oracle

run the following command at bash shell environment, you will see an interesting automatic output . So we have the Linux's amazing experience.

( sleep 2; echo "oracle" ; sleep 2 ; echo "oracle" ;sleep 2; echo "echo hello I'm oracle person."; sleep 2; echo "ls " ;sleep 2)|telnet localhost

2, use xargs , process only ONE parameter each time:

As we all knows, xargs could convert the string in a stream to the command line parameters, by default all string in the input stream will transport to parameter in one line, But we sometimes do wanna one parameter per line. How would we do ? Here is a sample to achieve it.

ls|xargs head -1 # add all parameter into one line.
ls|xargs -L1 -r head -1 # add each parameter into each line. This is we really wanted . with "-r" , do not run command head if input stream is NULL.

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