commands normally treat the last operand specially when it is a
directory or a symbolic link to a directory. For example, ‘cp
source dest’ is equivalent to ‘cp source dest/source’ if
dest is a directory. Sometimes this behavior is not exactly
what is wanted, so these commands support the following options to
allow more fine-grained control:
Do not treat the last operand specially when it is a directory or a symbolic link to a directory. This can help avoid race conditions in programs that operate in a shared area. For example, when the command ‘mv /tmp/source /tmp/dest’ succeeds, there is no guarantee that /tmp/source was renamed to /tmp/dest: it could have been renamed to /tmp/dest/source instead, if some other process created /tmp/dest as a directory. However, if mv -T /tmp/source /tmp/dest succeeds, there is no question that /tmp/source was renamed to /tmp/dest.
In the opposite situation, where you want the last operand to be treated as a directory and want a diagnostic otherwise, you can use the --target-directory (-t) option.
Use directory as the directory component of each destination file name.
The interface for most programs is that after processing options and a
finite (possibly zero) number of fixed-position arguments, the remaining
argument list is either expected to be empty, or is a list of items
(usually files) that will all be handled identically. The
program is designed to work well with this convention.
The commands in the
mv-family are unusual in that they take
a variable number of arguments with a special case at the end
(namely, the target directory). This makes it nontrivial to perform some
operations, e.g., “move all files from here to ../d/”, because
mv * ../d/ might exhaust the argument space, and
ls | xargs ...
doesn’t have a clean way to specify an extra final argument for each
invocation of the subject command. (It can be done by going through a
shell command, but that requires more human labor and brain power than
The --target-directory (-t) option allows the
mv programs to be used
xargs. For example, you can move the files
from the current directory to a sibling directory,
d like this:
ls | xargs mv -t ../d --
However, this doesn’t move files whose names begin with ‘.’.
If you use the GNU
find program, you can move those
files too, with this command:
find . -mindepth 1 -maxdepth 1 \ | xargs mv -t ../d
But both of the above approaches fail if there are no files in the
current directory, or if any file has a name containing a blank or
some other special characters.
The following example removes those limitations and requires both
find and GNU
find . -mindepth 1 -maxdepth 1 -print0 \ | xargs --null --no-run-if-empty \ mv -t ../d
The --target-directory (-t) and --no-target-directory (-T) options cannot be combined.