Can't log output from telnet when running as cron job

Help and Support
1

I’m using telnet to get data from a remote server.
If I run the command

telnet ente.hawo.stw.uni-erlangen.de 7337

from the terminal it works as expected and responds:

Trying 131.188.24.11…
Connected to ente.hawo.stw.uni-erlangen.de.
Escape character is ‘^]’.
4.55°C (4.98°C Ostseite / 4.55°C Westseite)Connection closed by foreign host.

If I run the same command as cron job and record the output to a logfile the response is quite different.
The output changes to

Trying 131.188.24.11…
Connected to ente.hawo.stw.uni-erlangen.de.
Escape character is ‘^]’.
Escape character is ‘^]’.
Escape character is ‘^]’.
Escape character is ‘^]’.

The most important part is missing: the expeced response of the server.

Any ideas about this?

2

For this kind of stuff you better use nc (sudo apt-get install netcat-openbsd)
Something like */1 * * * * nc ente.hawo.stw.uni-erlangen.de 7337 >> /tmp/mylogfile.log 2>&1 should do the job