On Jun 20 17:32:51, maxim.pich...@gmail.com wrote:
> dd bs=1 count=1234567 will copy 1234567 bytes and then stop, but it's slow.

$ dd bs=1 count=1234567 < /dev/zero > /dev/null
1234567+0 records in
1234567+0 records out
1234567 bytes transferred in 4.507 secs (273886 bytes/sec)

$ dd count=1 bs=1234567 < /dev/zero > /dev/null   
1+0 records in
1+0 records out
1234567 bytes transferred in 0.001 secs (653970943 bytes/sec)

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