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Some GNU programs (at least cp
, install
, ln
, and
mv
) optionally make backups of files before writing new versions.
These options control the details of these backups. The options are also
briefly mentioned in the descriptions of the particular programs.
VERSION_CONTROL
environment variable is used. And if VERSION_CONTROL
is not set,
the default backup type is `existing'.
Note that the short form of this option, `-b' does not accept any argument. Using `-b' is equivalent to using `--backup=existing'.
This option corresponds to the Emacs variable `version-control'; the values for method are the same as those used in Emacs. This option also accepts more descriptive names. The valid methods are (unique abbreviations are accepted):
SIMPLE_BACKUP_SUFFIX
environment variable is used. And if SIMPLE_BACKUP_SUFFIX
is not
set, the default is `~', just as in Emacs.
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