RHEL Release 5.5 (Tikanga), df --total option - linux

Question

I have a RHEL (Redhat Enterprise Linux) v6.5 (Santiago) server. On this server if i do a df -help there are list of options available. I am interested in the option --total
However there is an older version of RHEL (v5.5). In which there is no --total option.
My question is, I have a command like this:
df -h --total | grep total | awk 'NR==1{print$2}+NR==1{print$3}+NR==1{print$4}+NR==1{print$5}'
which gives the output as
62G
39G
21G
66%
Where
62G is Total size of the Disk
39G is Used
21G is remaining
61% Total usage %
The above command is working fine in RHEL v6.5. But fails in RHEL v5.5 since it does not have a --total option for df command.
When i run the same command on RHEL v5.5 i get the below error:
df: unrecognized option `--total'
Try `df --help' for more information.
So is there a command that can give me the output in the following way:
Total Disk Space
Used Space
Remaining Disk space
Usage %
Ex:
62G
39G
21G
66%

Answer 1

You'll have to do the calculation work yourself.
Something like this awk script should work.
$ cat dftotal.awk
BEGIN {
map[0] = "K"
map[1] = "M"
map[2] = "G"
map[3] = "T"
}
function fmt(val, c) {
c=0
while (val > 1024) {
c++
val = val / 1024
}
return val map[c]
}
{
for (i=2;i<5;i++) {
sum[i]+=$i
}
}
END {
print fmt(sum[2]) ORS fmt(sum[3]) ORS fmt(sum[4])
print ((sum[3] / sum[2]) * 100) "%"
}
$ df -P | awk -f dftotal.awk