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Name: Port Checker
Language: Bash
Purpose: Check to see if a port is available based on either the port # or program name passed.
Notes: Requires root privileges due to "p" switch being used in netstat



[/pre]

  
  #!/bin/bash
  
  # Script is used to determine if a port is used.
  # Usage: portcheck 
  # Executes netstat -ntlup | grep  to do checking.
  # Returned text is stored in a variable.  If variable is empty,
  # port is not in used.  Otherwise, port is being used.
  
  # Get the username of the person running script
  USER=`id -un`
  
  # Root is required to run netstat -ntlup
  if [ "$USER" != "root" ]; then
  	echo "Root privileges required."
  else
  	NET=`netstat -ntlup | grep $1`
  
  	if [ -z "$NET" ]; then
  		echo "Port is free"
  	else
  		echo $NET
  	fi
  fi[/port][/port][/pre]
 [/pre]

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