Comments on: Telnet: shell script to issue commands to telnet session.

By: Aaron Bish

Aaron Bish — Mon, 12 Sep 2011 19:06:37 +0000

# Wait for the reply and then hang up:
# echo “stats” | nc -w1 localhost 11211
That produces an error, since the ‘”‘ confuses memcached. The following does work:
echo stats | nc -w1 localhost 11211

By: Nathan Schmidt

Nathan Schmidt — Thu, 08 Jan 2009 20:21:45 +0000

Wait for the reply and then hang up:

echo “stats” | nc -w1 localhost 11211

By: Sunny Walia

Sunny Walia — Thu, 08 Jan 2009 20:04:00 +0000

It allows telnet session to be opened before sending the command. I had some problems on some of the servers without sleep. In some cases, I even had to jack it up to .8 so it had enough time:

[root@localhost /]# (echo stats) | telnet localhost 11211
Trying 127.0.0.1…
Connected to localhost.
Escape character is ‘^]’.
Connection closed by foreign host.
[root@localhost /]# (sleep .5;echo stats) | telnet localhost 11211
Trying 127.0.0.1…
Connected to localhost.
Escape character is ‘^]’.
STAT pid 28466
STAT uptime 23892687
STAT time 1231444944
STAT version 1.2.5
STAT pointer_size 32
STAT rusage_user 0.120007
STAT rusage_system 0.064004
STAT curr_items 0
STAT total_items 0
STAT bytes 0
STAT curr_connections 2
STAT total_connections 9
STAT connection_structures 3
STAT cmd_get 0
STAT cmd_set 0
STAT get_hits 0
STAT get_misses 0
STAT evictions 0
STAT bytes_read 35
STAT bytes_written 1894
STAT limit_maxbytes 268435456
STAT threads 1
END
Connection closed by foreign host.

And since you mentioned the nc command, I will update the post with that command as well. Thanks.

By: jsled

jsled — Thu, 08 Jan 2009 01:21:22 +0000

What’s the point of the sleep command?

You might want to look into netcat (nc) as a telnet alternative; it has a whole section of its manpage about “why not just use telnet to connect to arbitrary ports?”.

Cheers