Package: coreutils Version: 8.25-2+b1 Severity: minor Dear Maintainer,
The man page for dd does not define an interaction between bs and its more specific ibs and obs options. POSIX does mandate that bs, if specified, shall override ibs and obs. Empirically I have determined that coreutils dd implements POSIX behaviour, so I should like to suggest the man page is updated to state that bs overrides ibs and/or obs. POSIX man page at http://www.unix.com/man-page/posix/1posix/dd/ defines the three options bs, ibs, and obs as follows: ibs=expr Specify the input block size, in bytes, by expr (default is 512). obs=expr Specify the output block size, in bytes, by expr (default is 512). bs=expr Set both input and output block sizes to expr bytes, superseding ibs= and obs=. If no conversion other than sync, noerror, and notrunc is specified, each input block shall be copied to the output as a single block without aggregating short blocks. Extracts from the current coreutils man page read as follows: bs=BYTES read and write up to BYTES bytes at a time ibs=BYTES read up to BYTES bytes at a time (default: 512) obs=BYTES write BYTES bytes at a time (default: 512) I would like to suggest that the explanation is amended as follows: bs=BYTES read and write up to BYTES bytes at a time (default: 512); overrides ibs and obs -- System Information: Debian Release: stretch/sid APT prefers stable APT policy: (900, 'stable'), (800, 'testing'), (300, 'unstable') Architecture: amd64 (x86_64) Kernel: Linux 4.8.0-2-amd64 (SMP w/1 CPU core) Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8) Shell: /bin/sh linked to /bin/dash Init: systemd (via /run/systemd/system) Versions of packages coreutils depends on: ii libacl1 2.2.52-3 ii libattr1 1:2.4.47-2 ii libc6 2.24-8 ii libselinux1 2.6-3 coreutils recommends no packages. coreutils suggests no packages. -- no debconf information
