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Your var "host_file" gets the previous value of $OPTARG. Just add a colon.
-f hostfile(each host in new line)
...
while getopts "hs:e:m:f:" OPTION
...
f)
...

Can we grep out the . and try..?
# Machine - GNU Linux's output
who -a | grep -v " \. "
who -a | awk '$6!="."{print}'

If your file is called "edit-this", try
more .edit-this.swp

:w /tmp/current
:!diff -c /tmp/current % | less

---------- Post updated at 23:53 ---------- Previous update was at 23:52 ----------

This is vim specific.