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SI prefixes with printf

In ksh only (not in bash), this just works:

printf '%#d\n' 105000000
105M

Even this!!!

printf "%#d\n" 12e+12 1.2e+4 12e+6
12T
12k
12M

printf has to be called directly in ksh, but not as part of e.g. awk or as part of a pipe with xargs...

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