How do i find free space in my unix?

Linux and Unix-Like Red Hat
1

Hello, I wanted to calculate free space in my unix file system. Here is my direction. I can use df -h command to get the below output.

Filesystem            Size  Used Avail Use% Mounted on
===================================================

/dev/vx/dsk/edcdg/data01vol
                       59G   51G  7.2G  88% /data01
/dev/vx/dsk/edcdg/data02vol
                       59G   52G  6.9G  89% /data02
/dev/vx/dsk/edcdg/data03vol
                       59G   52G  6.7G  89% /data03
/dev/vx/dsk/edcdg/data04vol
                       59G   51G  7.2G  88% /data04
/dev/vx/dsk/edcdg/data05vol
                       59G   49G  9.8G  84% /data05
/dev/vx/dsk/edcdg/data06vol
                       59G   50G  8.9G  85% /data06
/dev/vx/dsk/edcdg/data07vol
                       59G   53G  6.1G  90% /data07
/dev/vx/dsk/edcdg/data08vol
                       59G   52G  6.8G  89% /data08
/dev/vx/dsk/archdg/arch01vol
                       59G  489M   55G   1% /dbArch
/dev/vx/dsk/workdg/work01vol
                      176G   40G  128G  24% /work
/dev/vx/dsk/orasysdg/orasysvol1
                       51G   33G   18G  65% /orasys
/dev/vx/dsk/undodg/undovol1
                       51G  8.1G   41G  17% /undo
/dev/vx/dsk/redodg/redovol1
                       21G  820M   19G   5% /redo01
/dev/vx/dsk/redodg/redovol2
                       21G  820M   19G   5% /redo02
/dev/vx/dsk/redodg/redovol3
                       21G  820M   19G   5% /redo03

===============================================

In each file system, in the AVAIL column, i need to minus 10% and find the grand total. That will be the free space in my server..

How do i do this? I thought of moving this whole output to excel file and deduct 10% from Avail column. But i am not able to move the unix output to excel with correct format.

2 
$ df -h | awk 'NF == 5 {T+=$3} END {print "Total: " T ".  90% of that is " T*.9}' 
Total: 358.6.  90% of that is 322.74
3

You are the Man!!!

---------- Post updated at 12:36 PM ---------- Previous update was at 11:42 AM ----------

Your script looks good for linux. I have sun OS server. It is not working correctly for SUN OS machine. The AWK script should behave same way in all unix machine. But somehow not...

xmydll002*/export/home/oracle
>uname
SunOS

xmydll002*/export/home/oracle
>df -h
Filesystem             size   used  avail capacity  Mounted on
/dev/md/dsk/d0         103G    27G    76G    26%    /
/devices                 0K     0K     0K     0%    /devices
ctfs                     0K     0K     0K     0%    /system/contract
proc                     0K     0K     0K     0%    /proc
mnttab                   0K     0K     0K     0%    /etc/mnttab
swap                    38G   1.1M    38G     1%    /etc/svc/volatile
objfs                    0K     0K     0K     0%    /system/object
sharefs                  0K     0K     0K     0%    /etc/dfs/sharetab
/platform/sun4u-us3/lib/libc_psr/libc_psr_hwcap1.so.1
                       103G    27G    76G    26%    /platform/sun4u-us3/lib/libc_psr.so.1
/platform/sun4u-us3/lib/sparcv9/libc_psr/libc_psr_hwcap1.so.1
                       103G    27G    76G    26%    /platform/sun4u-us3/lib/sparcv9/libc_psr.so.1
fd                       0K     0K     0K     0%    /dev/fd
swap                   2.0G   2.6M   2.0G     1%    /tmp
swap                    38G    48K    38G     1%    /var/run
swap                    38G     0K    38G     0%    /dev/vx/dmp
swap                    38G     0K    38G     0%    /dev/vx/rdmp
/dev/vx/dsk/xyd900/vol003
                        60G    52G   7.6G    88%    /data01
/dev/vx/dsk/xyd900/vol004
                        60G    53G   6.7G    89%    /data02
/dev/vx/dsk/xyd900/vol014
                        60G    53G   6.2G    90%    /data12
/dev/vx/dsk/xyd900/vol011
                        60G    53G   6.5G    90%    /data09
/dev/vx/dsk/xyd900/vol009

xmydll002*/export/home/oracle

xmydll002*/export/home/oracle
>df -h | grep vol0 | awk 'NF == 5 {T+=$3} END {print "Total: " T ".  90% of that is " T*.9}'
Total: .  90% of that is 0

xmydll002*/export/home/oracle
>
4

Try replacing awk with gawk for SunOS.

5

Dnbert, gawk is not accepting. it accepts only awk, nawk. It is not giving correct result if we use awk, nawk.

uxydal9878*/export/home/oracle
>uname -a
SunOS uxydal9878 5.10 Generic_138888-03 sun4u sparc SUNW,Sun-Fire-V890

uxydal9878*/export/home/oracle
>df -h | nawk 'NF == 5 {T+=$3} END {print "Total: " T ". 90% of that is " T*.9}'
Total: . 90% of that is 0

uxydal9878*/export/home/oracle
>df -h | awk 'NF == 5 {T+=$3} END {print "Total: " T ". 90% of that is " T*.9}'
Total: . 90% of that is 0

uxydal9878*/export/home/oracle
>df -h | gawk 'NF == 5 {T+=$3} END {print "Total: " T ". 90% of that is " T*.9}'
-bash: gawk: command not found

uxydal9878*/export/home/oracle
>

6

I should have read your entire snippet. Haha, sorry.

Try something like this:

df |grep -v Ava| cut -c 43-52 | awk 'BEGIN {total=0} {total += $1} {total * .9} END {print total}'

I haven't tested this so be weary, especially with that cut. That was just a guesstimation.

7

Thanks.. I might need to learn more about AWK programming to get this done. But the beauty is, the same code works in linux and does not work in sunos...

df -h | awk 'NF == 5 {T+=$3} END {print "Total: " T ". 90% of that is " T*.9}'

8

GNU awk is used in 99% of all Linux and has some extended features the lack of which can turn simple solutions very ugly. Much like how GNU date's -d option is so convenient; "how do I subtract dates in shell?" "convert to seconds with GNU date and subtract" "I don't have GNU date" "Then try this 4-page shell script but not on leap years!"

9

Hi.

You can get the awk to behave the same way on all machines. The problem is that df doesn't!

On Solaris 10:

# df -k | awk 'NR > 1 {T+=$(NF-2)} END {print T/1024/1024 " GB.  90% of that is " T/1024/1024*.9 " GB"}'
32.4194 GB.  90% of that is 29.1775 GB
10

Thanks Corona688, Thanks scott. Your response Helps.