#!/usr/bin/perl -w

format DISKSPACE =
($Filesytem,$kbytes, $used, $avail, $capacity, $Mounted_on) = split (/ /);

======================
|@<<<<<<<<<<<<<<<<<<<|
$FileSystem
|@<<<<<<<<<<<<<<<<<<<|
$kbytes
|@<<<<<<<<<<<<<<<<<<<|
$used
|@<<<<<<<<<<<<<<<<<<<|
$avail
|@<<<<<<<<<<<<<<<<<<<|
$capacity
|@<<<<<<<<<<<<<<<<<<<|
$Mounted_on
======================
.


sub df_total {

#    if ($answer eq "F") {
#    write ($answer);

open (DISKSPACE,">spaceavail.txt") || die "Error opening file spaceavail.txt";
while (<DISKSPACE>) {
  chop;
  ($Filesytem,$kbytes, $used, $avail, $capacity, $Mounted_on) = split (/ /);
  write (DISKSPACE);
close (DISKSPACE)
}
}

print "\n  My First Perl Menu\n";
print "A.  Current Date & Time\n";
print "B.  Users currently logged in\n";
print "C.  Name of working directory\n";
print "D.  Contents of the working directory\n";
print "E.  Names & Login names of user currently logged on to aries\n";
print "F.  Aries Disk Space Utilization\n";

print "Enter A, B, C, D, E, F: \n";

$answer = <STDIN>;
chomp ($answer);

if ($answer eq "A") {
      system "date \n";
}
elsif
    ($answer eq "B") {
      system "who \n";
}
elsif
   ($answer eq "C") {
     system "pwd \n";

}

elsif
   ($answer eq "D") {
     system "ls -Fla \n";
}

elsif
   ($answer eq "E") {
     system "finger \n";
}

elsif
   ($answer eq "F") {
     system "df -k \n";
     &df_total
}

else {
   print "The selection you entered: $answer, is incorrect. Please enter A, B, C
 or D \n";
}