new line issue with netcat [closed]

Question

I am using below command to send some strings to udp listening server.

echo "A 192.168.192.168" | nc -u 192.168.2.1 1234

but the server is getting trailing '\n' in echoed string.

I have tried below command too, but failed

echo "A 192.168.192.168" | nc -uC 192.168.2.1 1234

How can I remove that trailing new line character ?? Do I have any special option in nc ??

Answer 1

echo usually provides -n flag. This is not standard.

string A string to be written to standard output. If the first operand is -n, or if any of the operands contain a backslash ( '\' ) char‐ acter, the results are implementation-defined.

On XSI-conformant systems, if the first operand is -n, it shall be treated as a string, not an option.

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I would suggest using printf

printf "A 192.168.192.168" | nc -u 192.168.2.1 1234

printf doesnt append a new line unless it is told to, and it's standard behavior.

Answer 2

Try using

echo -n

so

echo -n "A 192.168.192.168" | nc -u 192.168.2.1 1234

echo man page says: -n do not output the trailing newline