Shell Programming and Scripting

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

#!/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

++ 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

#!/bin/bash

while read -r host type port _ <&3; do
  [[ $type = *"$1"* ]] || continue

  if nc -z "$host" "$port"; then
    echo "Connection to $host on port $port succeeded"
  else
    echo "Connection to $host on port $port failed"
  fi
done 3<ports.hosts

if telnet "$host" "$port" 2>/dev/null <<< quit | grep -q ^Escape; then