I want to use awk to compare values piped from "df" like so:
df:
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/sda1 725649232 118249576 571080120 18% /
udev 2994044 4 2994040 1% /dev
tmpfs 1201132 1120 1200012 1% /run
none...
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