dd: only print concise byte counts if count is sufficiently large #3617
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Update `dd` to only print a concise form of the number of bytes with
an SI prefix (like "1 MB" or "2 GB") if the number is at least
1000. Similarly, only print the concise form with an IEC prefix (like
"1 MiB" or "2 GiB") if the number is at least 1024. For example,
$ head -c 999 /dev/zero | dd > /dev/null
1+1 records in
1+1 records out
999 bytes copied, 0.0 s, 999.0 KB/s
$ head -c 1000 /dev/zero | dd > /dev/null
1+1 records in
1+1 records out
1000 bytes (1000 B) copied, 0.0 s, 1000.0 KB/s
$ head -c 1024 /dev/zero | dd > /dev/null
2+0 records in
2+0 records out
1024 bytes (1 KB, 1024 B) copied, 0.0 s, 1.0 MB/s
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Update
ddto only print a concise form of the number of bytes with an SI prefix (like "1 MB" or "2 GB") if the number is at least 1000. Similarly, only print the concise form with an IEC prefix (like "1 MiB" or "2 GiB") if the number is at least 1024. Previously, it was always printing both forms. For example,This matches the behavior of GNU
dd, even though the format of the concise byte counts is still not quite right. The format can be fixed in a future pull request.