//View Tip #249
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Longish oneliner (I actually wrote it in one line first) for giving you somewhat (mount list is never good enough) accurate sum of your file systems' totals.

df | egrep -v "(Filesystem|\/dev$|shm$|dvd|cdrom)" | awk '{totalu += $2 ; totalf += $4} END {print "Total space in devices: " (totalu/1024/1024) " GB\nFree space total: " (totalf/1024/1024) " GB"}'

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