ref: c52095c4da2055ab62a481e8be4c15919d081ef3
dir: /README/
CLONE(1) CLONE(1)
NAME
clone - copy files and directories
SYNOPSYS
clone [ -gux ] [ -b blocksize ] [ -p fileprocs:blockprocs ]
from ... to
DESCRIPTION
Clone copies files and directories. Similar in spirit to
fcp(1) it is a multi-process program which relies on
pread(2) and pwrite(2) system calls to copy multiple blocks
in parallel, speeding up the file transfer over high-latency
links; in contrast to fcp(1) it can copy both single files
and directories, which may be mixed on the command line.
A single file is copied as expected. If to does not exist,
it is created; otherwise, an existing file is overwritten;
if to is a directory, from is copied into it. A single
directory is copied into to if it exists; otherwise, a new
directory to is created and the contents of from are copied
into it. If multiple source files (directories) are given,
they are copied into the to directory, which is created if
neccessary.
The -x option sets the mode and modified time of the desti-
nation file (directory) to that of the source file (direc-
tory); the -g and -u try to set the group and user id,
respectively.
The -b option determines the size of a block that will be
transfered by a single block transfer process (defaults to
128k).
The -p option determines the process parallelism configura-
tion, with fileprocs being the number of processes that han-
dle simultaneous file transfers, and blockprocs being the
number of processes that do the input / output (defaults to
4:16).
SOURCE
https://bitbucket.org/k-vik/clone
SEE ALSO
fcp(1), dircp(1), pread(2), pwrite(2)
BUGS
Preserving the modification time of directories does not
work. Attributes are cloned at directory creation time;
meaning, if there's files to be copied in this directory,
this will update the parent modification time. Furthermore,
all directories get the forced write permission, since not
having one would mean no new file creation.