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| -rw-r--r-- | doc/coreutils.texi | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/doc/coreutils.texi b/doc/coreutils.texi index 61b3c8925..767267bf3 100644 --- a/doc/coreutils.texi +++ b/doc/coreutils.texi @@ -8167,9 +8167,12 @@ On a file system that supports sparse files, this will create sparse output when extending the output file. Be careful when using this option in conjunction with @samp{conv=notrunc} or @samp{oflag=append}. -With @samp{conv=notrunc}, existing data in the output +With @samp{conv=notrunc}, existing data in the output file corresponding to @sc{nul} blocks from the input, will be untouched. With @samp{oflag=append} the seeks performed will be ineffective. +Similarly, when the output is a device rather than a file, +@sc{nul} input blocks are not copied, and therefore this option +is most useful with virtual or pre zeroed devices. @item swab @opindex swab @r{(byte-swapping)} |