我如何减少连接时 unix telnet 上的超时 [英] how do i reduce timeout on unix telnet on connection

问题描述

我有一个 unix shell 脚本，用于测试文件中列出的多个主机的 ftp 端口.

I have a unix shell script which test ftp ports of multiple hosts listed in a file.

for i in `cat ftp-hosts.txt`
        do
        echo "QUIT" | telnet $i 21
done

一般来说，这个脚本可以工作，但是如果我遇到一个无法连接的主机，即 telnet 正在尝试..."，我该如何减少等待时间以便它可以测试下一个主机?

In general this scripts works, however if i encounter a host which does not connect, i.e telnet is "Trying...", how can I reduce this wait time so it can test the next host ?

推荐答案

您是否尝试过使用 netcat (nc) 而不是 telnet?它具有更大的灵活性，包括能够设置超时:

Have you tried using netcat (nc) instead of telnet? It has more flexibility, including being able to set the timeout:

echo 'QUIT' | nc -w SECONDS YOUR_HOST PORT
# e.g.
echo "QUIT" | nc -w 5       localhost 21

-w 5 选项将在 5 秒后超时连接.

The -w 5 option will timeout the connection after 5 seconds.

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