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How to Create a shell script to test the telnet connection status

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Top Forums Shell Programming and Scripting How to Create a shell script to test the telnet connection status
# 8  
Old 03-19-2009
Quote:
Originally Posted by ghostdog74
what version is your sun solaris OS?

SunOS 5.8 Generic_117350-38 sun4u sparc SUNW,Sun-Fire-V890

Thanks
# 9  
Old 03-19-2009
Quote:
Originally Posted by ghostdog74
what version is your sun solaris OS?
The version is

SunOS 5.8 Generic_117350-38 sun4u sparc SUNW,Sun-Fire-V890
# 10  
Old 03-19-2009
Quote:
Originally Posted by pludi
Please use [code ][/code] (sans the space) tags for source and listings, it's easier to read.

The ${MACHINE} that I used was in preparation for the loop that you'll need for that many machines (it's substituted by the value of the variable MACHINE)

Change it like this and try again
Code:
MACHINE=10.0.0.1 # Change to what ever you need
exec 3>/dev/tcp/${MACHINE}/2071
if [ $? -eq 0 ]
then
    echo "Telnet accepting connections"
else
    echo "Telnet connections not possible"
fi



Hi,
Code:
MACHINE=10.2.191.100 
MACHINE=10.1.101.100 
MACHINE=10.3.181.100 
exec 3>/dev/tcp/${MACHINE}:2061
if [ $? -eq 0 ]
then
    echo "Telnet accepting connections"
else
    echo "Telnet connections not possible"
fi

and the result is below

Code:
bash-2.03$ MACHINE=10.2.191.100
bash-2.03$ MACHINE=10.1.101.100
bash-2.03$ MACHINE=10.3.181.100
bash-2.03$ exec 3>/dev/tcp/${MACHINE}:2061
bash: /dev/tcp/10.3.181.100:2061: Not a directory
bash-2.03$ if [ $? -eq 0 ]
> then
>     echo "Telnet accepting connections"
> else
>     echo "Telnet connections not possible"
> fi
Telnet connections not possible

Sorry, please guide me.
Many Thanks
# 11  
Old 03-19-2009
not guaranteed to work, but you can try
Code:
# sleep 3 | telnet somewhere portnumer

use grep or awk to grab messages to confirm connection or refusal
# 12  
Old 03-19-2009
Quote:
Originally Posted by yhcheong
Code:
MACHINE=10.2.191.100 
MACHINE=10.1.101.100 
MACHINE=10.3.181.100 
exec 3>/dev/tcp/${MACHINE}/2061
if [ $? -eq 0 ]
then
    echo "Telnet accepting connections"
else
    echo "Telnet connections not possible"
fi

If you copy and paste, do so correctly. It's /dev/tcp/<machine>/<port>. The seperator is always the forward slash.
And you might want to start with some basic texts about shell programming, because that is not how you construct a loop (except maybe if you can create a DWIMTD function). There's a good introduction available here. It's written for Linux, but there are very few specific things used, most applies to any platform that bash runs on.
Code:
MACHINES="10.2.191.100 10.1.101.100 10.3.181.100"
for MACHINE in ${MACHINES}
do
    exec 3>/dev/tcp/${MACHINE}/2061
    if [ $? -eq 0 ]
    then
        echo "${MACHINE}: Telnet accepting connections"
    else
        echo "${MACHINE}: Telnet connections not possible"
    fi
done

# 13  
Old 03-19-2009
Quote:
Originally Posted by pludi
If you copy and paste, do so correctly. It's /dev/tcp/<machine>/<port>. The seperator is always the forward slash.
And you might want to start with some basic texts about shell programming, because that is not how you construct a loop (except maybe if you can create a DWIMTD function). There's a good introduction available here. It's written for Linux, but there are very few specific things used, most applies to any platform that bash runs on.
Code:
MACHINES="10.2.191.100 10.1.101.100 10.3.181.100"
for MACHINE in ${MACHINES}
do
    exec 3>/dev/tcp/${MACHINE}/2061
    if [ $? -eq 0 ]
    then
        echo "${MACHINE}: Telnet accepting connections"
    else
        echo "${MACHINE}: Telnet connections not possible"
    fi
done


Thanks for the guide. But it seems like this line of the code not functioning.
Code:
 exec 3>/dev/tcp/${MACHINE}/2061

When I check the dev/TCP, it isn't a directory. I've execute the shell code, but the error prompt as below:
Code:
bash-2.03$
bash-2.03$ MACHINES="10.97.124.100 10.12.44.10"
bash-2.03$ for MACHINE in ${MACHINES}
> do
>     exec 3>/dev/tcp/${MACHINE}/2061
>     if [ $? -eq 0 ]
>     then
>         echo "${MACHINE}: Telnet accepting connections"
>     else
>         echo "${MACHINE}: Telnet connections not possible"
>     fi
> done
bash: /dev/tcp/10.97.124.100/2061: Not a directory
10.67.170.100: Telnet connections not possible
bash: /dev/tcp/10.12.44.10/2061: Not a directory

# 14  
Old 03-19-2009
/dev/tcp/... isn't a directory on any UNIX system that I know of, but a hint for bash to open a TCP connection and use it as a file handle. If bash complains about it that probably means that this functionality isn't supported.
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