Zabbix Monitoring TCP Status scripts

#!/bin/bash
#this script is used to get TCP and UDP connetion status
#tcp status
Metric=$1
Tmp_file=/tmp/tcp_status.txt
Touch $tmp _file
Chown Zabbix. $tmp _file
/usr/bin/netstat-an|awk '/^tcp/{++s[$NF]}end{for (A in S) print A,s[a]} ' > $tmp _file



Case $metric in
Closed
output=$ (awk '/closed/{print ' $tmp _file)
If ["$output" = = ""];then
Echo 0
Else
Echo $output
Fi
;;
Listen
output=$ (awk '/listen/{print ' $tmp _file)
If ["$output" = = ""];then
Echo 0
Else
Echo $output
Fi
;;
SYNRECV)
output=$ (awk '/syn_recv/{print ' $tmp _file)
If ["$output" = = ""];then
Echo 0
Else
Echo $output
Fi
;;
Synsent)
output=$ (awk '/syn_sent/{print ' $tmp _file)
If ["$output" = = ""];then
Echo 0
Else
Echo $output
Fi
;;
Established)
output=$ (awk '/established/{print ' $tmp _file)
If ["$output" = = ""];then
Echo 0
Else
Echo $output
Fi
;;
timewait)
output=$ (awk '/time_wait/{print ' $tmp _file)
If ["$output" = = ""];then
Echo 0
Else
Echo $output
Fi
;;
Closing
output=$ (awk '/closing/{print ' $tmp _file)
If ["$output" = = ""];then
Echo 0
Else
Echo $output
Fi
;;
closewait)
output=$ (awk '/close_wait/{print ' $tmp _file)
If ["$output" = = ""];then
Echo 0
Else
Echo $output
Fi
;;
Lastack)
output=$ (awk '/last_ack/{print ' $tmp _file)
If ["$output" = = ""];then
Echo 0
Else
Echo $output
Fi
;;
FINWAIT1)
output=$ (awk '/fin_wait1/{print ' $tmp _file)
If ["$output" = = ""];then
Echo 0
Else
Echo $output
Fi
;;
FINWAIT2)
output=$ (awk '/fin_wait2/{print ' $tmp _file)
If ["$output" = = ""];then
Echo 0
Else
Echo $output
Fi
;;
*)
Echo-e "\e[033musage:sh [closed|closing|closewait|synrecv|synsent|finwait1|finwait2|listen|established|lastack |timewait]\e[0m "

Esac