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df –total command for mac?

I want to use command line to retrieve the total disk space on a machine as one value. On most Linux machines, the “df –total” returns such a value at the end of the regular df output.

On osx9, 10, 11, and 12, there seems to be no option like this. 

[u'df: illegal option -- -n', u'usage: df [-b | -H | -h | -k | -m | -g | -P] [-ailn] [-T type] [-t] [filesystem ...]n']

Same issue with older linux os, redhat5, centos5, etc.

Another way to approach this? Is there another command to isolate certain values? I am mainly looking for the “total% used” value.

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Answer

You’ll have to calculate the value yourself, e.g. using awk:

df | awk '
    BEGIN { SIZE=0; USED=0; AVAILABLE=0 }
    // { print }
    $3~/[0-9]/ { SIZE += $2; USED += $3; AVAILABLE += $4 }
    END { printf "totalt%lut%lut%lut%d%%n", SIZE, USED, AVAILABLE, (USED * 100 / SIZE); }'

to break it down

  • line 1 of awk sets up the variables at the start,
  • line 2 prints every line (I’m making it explicit),
  • line 3 says if I find a number in the third column add it to the totals
  • line 4 says at the end print a ‘total’ line (somewhat similar to --total‘s line)
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