Bash script with netcat operations on different server and port - bash

Question

I am a bit lost. I have created a script which starts by retrieving data from a CSV file. Each line contains an IP address and a few ports to test. The goal is to verify that it is possible to connect to each server (under the given IP) on specifics ports. In order to verify, the following code is used:
nc -w 3 -v $ipValeur >> retour.txt 2>&1
Nevertheless, it doesn't work and it returns Connection Timed out. It is strange. In fact, if I launch a telnet command from a terminal, it works. Nevertheless, the goal is to check if a server can be connected to a lot of others. So, if telnet is used, it will be very long (one or two days ?)...
So, I am looking for a way which permits to automatically verify the access from one server to thirty others on a few ports. You can find the code which is actually used at How to continue next iteration when an error occurs in Bash.
Thank you for your help.
Solution
#!/bin/bash
INPUT_FILE=$1
while IFS='' read -r line || [ -n "$line" ]; do
IFS=';' read -ra cvsline <<<${line}
HOSTNAME=${cvsline[0]}
ports=("${cvsline[#]:1}")
for port in ${ports[*]}; do
echo -n "Verification ${HOSTNAME}:${port}..."
echo 'QUIT' | nc -w 3 -v "${HOSTNAME}" "${port}" >/dev/null 2>&1
if [ $? -eq 0 ]; then
echo "OK"
else
echo "KO"
fi
done
done < $INPUT_FILE
Vinz

Answer 1

The answer may be, that in command: nc -w 3 -v $ipValeur >> retour.txt 2>&1 you not passed port number, and was used default one all the times
I not really able to understand your source code, so i have written my own based on description:
#!/bin/bash
INPUT_FILE=$1
while IFS='' read -r line || [ -n "$line" ]; do
IFS=';' read -ra cvsline <<<${line}
HOSTNAME=${cvsline[0]}
ports=("${cvsline[#]:1}")
for port in ${ports[*]}; do
echo -n "Cheking ${HOSTNAME}:${port}..."
nc -zw 3 "${HOSTNAME}" "${port}" >/dev/null 2>&1
if [ $? -eq 0 ]; then
echo "connected"
else
echo "not connected"
fi
done
done < $INPUT_FILE
Usage:
./script hostlist.cvs
Where hostlist.cvs:
127.0.0.1;80;90;100;
127.0.0.2;80;88;21;
10.255.0.1;80;443;
And output sample:
$ ./test.sh /tmp/1
Cheking 127.0.0.1:80...not connected
Cheking 127.0.0.1:90...not connected
Cheking 127.0.0.1:100...not connected
Cheking 127.0.0.2:80...not connected
Cheking 127.0.0.2:88...not connected
Cheking 127.0.0.2:21...not connected
Cheking 10.255.0.1:80...connected
Cheking 10.255.0.1:443...not connected