This script is specially designed for those systems on which "df -h" command doesn't work well or displayes the output in two lines for every filesystem. example is given below :
bash-3.2$ df -h Filesystem size used avail capacity Mounted on /plat/sun4/lib/libc_psr/libc_psr_hwcap1.so.1 4.9G 4.4G 467M 91% /plat/sun/lib/libc_psr.so.1 /platform/sun4u-us3/lib/sparcv9/libc_psr/libc_psr_hwcap1.so.1 4.9G 4.4G 467M 91% /plat/sun/lib/sparcv9/libc_psr.so.1
This script checks the /var FS size if it reaches to 80% and send mail to user.