Shell Programming and Scripting

> cat get_free_space_FS.ksh
#! /bin/ksh

FS=/dw/mar
FreeSpace=`df -h | grep $FS | awk '{print $4}'`
echo $FreeSpace

> ./get_free_space_FS.ksh
362G

FreeSpace=`df -h | grep $FS | awk '{print $4}'`

FreeSpace=`df -h | grep $FS | awk '{print $4 + 0}'`

#  df -h /tmp
Filesystem             size   used  avail capacity  Mounted on
swap                    78G   670M    77G     1%    /tmp

so,


#  df -h /tmp |awk 'NR==2{print substr($4,1,length($4)-1)}'
77

df -k | grep $FS | awk '{printf "%d\n",$4/1024/1024}'

df -k $FS | awk '{printf "%d\n",$4/1024/1024}'