Shell Script 041-diskspace.sh

#!/bin/sh

# diskspace - summarize available disk space and present in a logical
#    and readable fashion

tempfile="/tmp/available.$$"

trap "rm -f $tempfile" EXIT

cat << 'EOF' > $tempfile
    { sum += $4 }
END { mb = sum / 1024
      gb = mb / 1024
      printf "%.0f MB (%.2fGB) of available disk space\n", mb, gb
    }
EOF

df -k | awk -f $tempfile

exit 0