Bash scripting problem?

That works just fine in my bash: $ cat hosts. Txt machine1 machine3 $ cat hosts. Txt | while read h; do telnet $h; done Trying 9.190.123.47... telnet: Unable to connect to remote host: Connection refused Trying 9.190.123.61... telnet: Unable to connect to remote host: Connection refused However, when I connect to a machine that doesn't refuse the connection, I get: $ cat hosts.

Txt machine2 machine1 machine3 $ cat hosts. Txt | while read h; do telnet $h; done Trying 9.190.123.48... Connected to machine2. Escape character is '^'.

Connection closed by foreign host. That's because I'm actually connecting successfully and all the other host names are being sent to the telnet session. These are no doubt being used to attempt a login, the remaining host names are invalid as user/password and the session is being closed because of that.

If you just want to log in interactively to each system, you can use: for h in $(cat hosts. Txt); do telnet $h 1023; done which will not capture the rest of the host names into the first successful session. If you want to truly automate a telnet session, you should look into a tool such as expect or using one of the remoting UNIX tools such as rsh.

Rsh (remote shell) has a history of not being secure. I would recommend ssh. – ghostdog74 Jan 19 '10 at 6:37.

Telnet is interactive. What are you actually wanting to do? If you want to automate "telnet" session, you can use SSH while read -r host do ssh "$host" done.

As mentioned previously telnet is an interactive program that expects input. At a guess all hosts after the first are consumed as input by the first telnet. It is not clear what your script is trying to do.

Perhaps you need to be clearer on what you are trying to do.

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