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| -rw-r--r-- | doc/coreutils.texi | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/doc/coreutils.texi b/doc/coreutils.texi index 05dcd668b..347ceb492 100644 --- a/doc/coreutils.texi +++ b/doc/coreutils.texi @@ -6231,6 +6231,24 @@ tape=/dev/rmt/0 (dd bs=4k seek=1 count=0 && dd bs=512k) <$tape >$disk @end example +Note that sending a @samp{SIGUSR1} signal to a running @command{dd} +process makes it print to standard error the number of records read +and written so far, then to resume copying. In the example below, +@command{dd} is run in the background to copy 10 million blocks. +The @command{kill} command makes it output the first pair of +intermediate record counts, +and when @command{dd} completes, it outputs the final pair. + +@example +$ dd if=/dev/zero of=/dev/null count 10M & pid=$! +$ kill -USR1 $pid; sleep 99 +5403604+0 records in +5403604+0 records out +10485760+0 records in +10485760+0 records out +@end example + + @table @samp @item if=@var{file} |