title: Segmentation fault (core dumped) error in unix shell script. Help finding bug?
body: <p>Now, I already know that this means that there is a bug, But I cant find it. Could you help review my code and try to spot what is wrong?
  The error message revolves around the date function I created. All the other functions work fine in this code.</p>
  
  <p>Error:</p>
  
  <pre><code>sguthrie1@cs:~$ ./finalproject.sh -d 
  Segmentation fault (core dumped)
  </code></pre>
  
  <p>Code:</p>
  
  <pre><code>function check
  {
          echo "usage: hw14.sh option argument
  Please enter one or more options or arguments."
          exit
  }
  function date
  {
          if [[ $myvar == "-d" ]]
          then date "+%d %B,%Y"
          fi
  }
  function host
  {
          if [[ $myvar == "-h" ]]
          then hostname
          fi
  }
  function who
  {
          if [[ $myvar == "-w" ]]
          then whoami
          fi
  }
  function help
  {
          if [[ $myvar == "-help" ]]
          then echo "
  valid options:
  -d = display today's date in day-month-year format
  -h = display name of computer you are currently working on
  -w = display who you are logged in as
  arguments:
  Any argument entered is checked to see if it is a file name
  "
          fi
  }
  if [ $# -le 0 ]
  then check
  fi
  for myvar
  do
          if [[ $myvar == "-"* ]]
          then date; host; who; help
          fi
  done
  </code></pre>