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Full Discussion: Issue with looping
Top Forums Shell Programming and Scripting Issue with looping Post 302944737 by Junaid Subhani on Thursday 21st of May 2015 02:09:22 PM
Old 05-21-2015
Issue with looping

Hi guys,

I am creating a script that checks if a service is UP and running on a bunch of remote servers.

My list of servers is:

Code:
p2 runtime1 8080
p3 runtime2 8080
p4 runtime3 8080
p5 runtime4 8080
p6 runtime5 8080
p7 runtime6 8080
p8 runtime7 8080
p9 runtime8 8080
p10 runtime9 8080
p11 runtime10 8080
p12 runtime11 8080
p13 runtime12 8080

My column is Host Name ( resolvable by DNS), Node Type and Port.


My script is:

Code:
#!/bin/bash

NODE=`cat ports.hosts | grep $1 | awk '{print $2}' `


for i in $NODE
do
    node_port=`cat ports.hosts | grep $i | awk '{print $3}'`
    node_name=`cat ports.hosts | grep $i | awk '{print $1}'`

l_TELNET=`echo "quit" | telnet $node_name $node_port | grep "Escape character is"`
if [ "$?" -ne 0 ]; then
  echo "Connection to $node_name on port $node_port failed"
else
  echo "Connection to $node_name on port $node_port succeeded"
fi

done

But it seems to be creating an issue while looking.


Running the script in debugging mode says:
sh -x check_nodes.sh runtime

Code:
++ cat ports.hosts
++ grep runtime
++ awk '{print $2}'
+ NODE='runtime2
runtime3
runtime4
runtime5
runtime6
runtime7
runtime8
runtime9'

+ for i in '$NODE'
++ cat ports.hosts
++ grep runtime1
++ awk '{print $3}'
+ node_port='8080
8080
8080
8080
8080
8080
8080
8080'
++ cat ports.hosts
++ grep runtime1
++ awk '{print $1}'
+ node_name='p3
p4
p5
p6
p7
pvmkf108
pvmkf109
pvmkf110'
++ echo quit
++ telnet p3 p4 p5 p6 p7 p8 p9 p10 8080 8080 8080 8080 8080 8080 8080 8080 
++ grep 'Escape character is'
Usage: telnet [-8] [-E] [-L] [-S tos] [-a] [-c] [-d] [-e char] [-l user]
	[-n tracefile] [-b hostalias ] [-r] 
 [host-name [port]]
+ l_TELNET=
+ '[' 1 -ne 0 ']'
+ echo 'Connection to p3
p4
p5
p6
p7
p8
p9
p10 on port 8080
8080
8080
8080
8080
8080
8080
 failed'
+ echo 'Connection to p3
p4
p5
p6
p7
p8
p9
p10 on port 8080
8080
8080
8080
8080
8080
8080

8080 failed

Whats wrong in the loop ?
 

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CONNECT-PROXY(1)					      General Commands Manual						  CONNECT-PROXY(1)

NAME
connect-proxy -- connect over SOCKS4/5 proxy SYNOPSIS
connect-proxy [-dnhst45] [-R resolve ] [-p local-port ] [-w secs ] [-H [user@]proxy-server[:port]] ] [-S [user@]socks-server[:port]] ] [-T proxy-server[:port] ] [-c telnet-proxy-command ] [host] [port] DESCRIPTION
connect-proxy open connection over SOCKS4/5 proxies Please, note that any HTTP-Proxy tunnel won't work with content-inspection firewall (unless using SSL). OPTIONS
-H specifies a hostname and port number of the http proxy server to relay. If port is omitted, 80 is used. You can specify this value in the environment variable HTTP_PROXY and pass the -h option to use it. -S specifies the hostname and port number of the SOCKS server to relay. Like -H, port number can be omitted and the default is 1080. You can also specify this value pair in the environment variable SOCKS5_SERVER and give the -s option to use it. -4 specifies SOCKS relaying and indicates protocol version to use. It is valid only when used with '-s' or '-S'. Default is '-5' (protocol version 5) -R method to resolve the hostname. Three keywords ("local", "remote", "both") or dot-notation IP address are acceptable. The key- word "both" means, "Try local first, then remote". If a dot-notation IP address is specified, use this host as nameserver. The default is "remote" for SOCKS5 or "local" for others. On SOCKS4 protocol, remote resolving method ("remote" and "both") requires protocol 4a supported server. -p will forward a local TCP port instead of using the standard input and output. -P same to '-p' except keep remote session. The program repeats waiting the port with holding remote session without disconnecting. To connect the remote session, send EOF to stdin or kill the program. -w timeout in seconds for making connection with TARGET host. -d used for debug. If you fail to connect, use this and check request to and response from server. USAGE
To use proxy, this example is for SOCKS5 connection to connect to "host" at port 25 via SOCKS5 server on "firewall" host. connect-proxy -S firewall host 25 SOCKS5_SERVER=firewall; export SOCKS5_SERVER; connect-proxy -s host 25 For a HTTP-PROXY connection: connect-proxy -H proxy-server:8080 host 25 HTTP_PROXY=proxy-server:8080; export HTTP_PROXY; connect-proxy -h host 25 To forward a local port, for example to use ssh: connect-proxy -p 5550 -H proxy-server:8080 host 22 ssh -l user To use it along ssh transparently: # file://~/.ssh/config # not using proxy on lan Host 192.* ProxyCommand connect-proxy %h %p # mandatory to access the internet Host * ProxyCommand connect-proxy -H proxyserver:8080 %h %p Or for all users ( /etc/ssh/ssh_config ) ENVIRONMENT
SOCKS5_USER, SOCKS5_PASSWORD, HTTP_PROXY_USER, HTTP_PROXY_PASSWORD, CONNECT_PASSWORD, LOGNAME, USER SEE ALSO
ssh (1). WWW
http://www.meadowy.org/~gotoh/projects/connect AUTHOR
This manual page was written by Philippe Coval rzr@gna.org for the Debian system (but may be used by others). Permission is granted to copy, distribute and/or modify this document under the terms of the GNU General Public License, Version 2 any later version published by the Free Software Foundation. On Debian systems, the complete text of the GNU General Public License can be found in /usr/share/common-licenses/GPL. CONNECT-PROXY(1)
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