CODEWITHSUNDEEP
linuxbashshellguile
vishnu
vishnu

Reputation: 920

open telnet using shell and passing commands

I am new to linux and shell scripting. I want to connect to localhost and interact it. 

 #! /bin/bash
 (exec /opt/scripts/run_server.sh)

when i execute this bash script, it starts listening on a port. 

Listening on port xxxxx

Now i want to issue this command "telnet localhost xxxxx" I tried something like this:

#! /bin/bash
(exec /opt/opencog/scripts/run_server.sh)&&
telnet localhost xxxxx

It is still listening on the port. But i think second command is not running. I expect another window showing that it is being connected like this.

vishnu@xps15:~$ telnet localhost xxxx
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
server>

The reason why i executing these as a script is that, automatically in the server i need to carry out some process by issuing certain commands like this "scm" "parse" etc..... 

vishnu@xps15:~$ telnet localhost xxxx
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
server>scm
Entering scheme shell; use ^D or a single . on a line by itself to exit.
guile> (parse "i eat apple")

I have lots of text coming. Manually i cant issue this parse command for each and every sentence. so i want to automate. So i need to write a script for connecting to the server and interacting.

Any guidelines. Finally How to interact/send commands to this guile shell?

Upvotes: 0

Views: 3444

Answers (3)

Lyralover
Lyralover

Reputation: 21

If you need to use telnet, this solution may help you. Otherwise, use ssh, as other answer suggests.

You can use anything that produces output to write lines one by one, followed by "\r\n", and pipe these lines to ncat, e.g.:

echo -e "command1\r\ncommand2\r\n" | ncat localhost 5000

-e option makes echo interpret "\r\n" as special symbols.

Upvotes: 0

Aleksandar Pavić
Aleksandar Pavić

Reputation: 3420

One way to login to the linux server as a same or different user and run some command or .sh script (very useful for post-commit hooks or cron jobs) is to use program called sshpass, for example a cron job command or svn post-commit hook would look like this:

/usr/bin/sshpass -p 'password' /usr/bin/ssh 
-o StrictHostKeyChecking=no  -q user@localhost 'any command'

Just replace password with your password, and user with your user, and put command that you need to run as that particular user...

To install sshpass it on ubuntu just type 

apt-get install sshpass

Or on CentOs

yum install sshpass

Upvotes: 2

vishnu
vishnu

Reputation: 920

I solved this with the netcat (nc) command. 

  $ echo "command1\ncommand2\n" | nc localhost xxxxx

I could manually connect to localhost using telnet localhost xxxx and then i can pass commands from shell to localhost like this.

Upvotes: 0

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