I want check the free space in my hard disk.  Suppose I'm having 10GB HDD, I used only 7GB.  I want check how much remaining space is available.  Any command available for that.
 

df -k
du -sk directory
#!/bin/ksh
MAILTO="user@host.com"
echo "df -k output for `date` `uname -a`" > /tmp/df.out
case `uname -s` in
SunOS | Linux | OSF1 | UNIX_SV | FreeBSD )
if [ -s "/etc/redhat-release" ] ; then cat /etc/redhat-release >> /tmp/df.out ; fi
set -- `df -k | sed -e 's/%//g' | awk '/^\/dev/ { printf("%s %s\n", $5, $6) }'`
;;
HP-UX )
set -- `bdf | sed -e 's/%//g' | awk '/^\/dev/ { printf("%s %s\n", $5, $6) }'`
;;
AIX )
set -- `df -k | sed -e 's/%//g' | awk '/^\/dev/ { printf("%s %s\n", $4, $7) }'`
;;
esac

while [ $# -ge 2 ] ; do
CAPACITY=$1
FS=$2
shift 2

if [ $CAPACITY -gt 90 ] ; then
echo "$FS is at $CAPACITY %" >> /tmp/df.out
fi
done
if [ `wc -l /tmp/df.out | awk '{ print $1 }'` -ge 2 ] ; then
cat /tmp/df.out | mail -s "`date`" $MAILTO
fi
 

I sometimes prefer a "human readable" output which can be performed by adding an "h" switch:
$ df -h

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