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21.

When compressing, the suffix of the target file format (B<.xz> or B<.lzma>) is appended to the source filename to get the target filename.

22.

When decompressing, the B<.xz> or B<.lzma> suffix is removed from the filename to get the target filename. B<xz> also recognizes the suffixes B<.txz> and B<.tlz>, and replaces them with the B<.tar> suffix.

23.

If the target file already exists, an error is displayed and the I<file> is skipped.

24.

Unless writing to standard output, B<xz> will display a warning and skip the I<file> if any of the following applies:

25.

I<File> is not a regular file. Symbolic links are not followed, and thus they are not considered to be regular files.

26.

I<File> has more than one hard link.

27.

I<File> has setuid, setgid, or sticky bit set.

28.

The operation mode is set to compress and the I<file> already has a suffix of the target file format (B<.xz> or B<.txz> when compressing to the B<.xz> format, and B<.lzma> or B<.tlz> when compressing to the B<.lzma> format).

29.

The operation mode is set to decompress and the I<file> doesn't have a suffix of any of the supported file formats (B<.xz>, B<.txz>, B<.lzma>, or B<.tlz>).

30.

After successfully compressing or decompressing the I<file>, B<xz> copies the owner, group, permissions, access time, and modification time from the source I<file> to the target file. If copying the group fails, the permissions are modified so that the target file doesn't become accessible to users who didn't have permission to access the source I<file>. B<xz> doesn't support copying other metadata like access control lists or extended attributes yet.