如何在SCO UNIX下的反删除(undelete)

　　SCO OpenServer支持Versioning Filesystems(undelete)，但是缺省却没有打开此项功能，下面是具体细节:

　　1) scoadmin中选择Hardware/Kernel Manager，选择Filesystem configuration，

　　设置MAXVDEPTH为一个非零值(n=保存多少以前版本，设置较大数时要考虑磁盘空间)

　　设置MINVTIME(文件versioned之前等待的秒数)

　　2) 重新编译(Relink)内核;

　　3) 重新启动服务器;

　　4) 启用Undelete，针对需要设置undelete的目录(例如:/u/data)

　　undelete -s /u/data

　　5) 为了察看Versioned情况，设置以下环境变量:

　　SHOWVERSIONS=1; export SHOWVERSIONS

　　6) 用文件察看命令察看Versioned的文件，可以根据需要恢复删除或覆盖的文件。

　　undelete supports the following options:

　　If the -l， -p， -s， -u and -v options are not specified， undelete recovers the specified files.

　　-l

　　print a listing of all versions of the specified file(s)

　　-p

　　purge (permanently delete) specified source file(s)

　　-s

　　turn the version attribute on for the specified directories and its subsequent child directories

　　-u

　　turn the version attribute off for the specified directories

　　-v

　　force the specified file(s) to be versioned

　　The following additional options are recognized:

　　-d

　　normally， if the specified file is a directory， undelete will operate on the files contained in that directory. If this option is specified， undelete operates on the directory itself.

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　　NOTE: undelete does not work on directories that are mounted.

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　　-i

　　undelete will prompt for confirmation prior to recovering a file that will overwrite the current version of the file. A y answer means that the undeletion should proceed. Any other answer prevents undelete from undeleting the file.

　　-f

　　undelete will recover the file(s) without prompting even if it is overwriting over an existing current version of the file. This option overrides the -i option. Note that this is the default if the standard input is not a terminal.

　　-r

　　undelete will operate recursively on any directories in the argument list. Symbolic links that are encountered with this option will not be traversed.

　　-m [+-]days

　　undelete will only consider files that were deleted less than ( - )， greater than ( + ) or exactly (neither - nor + ) days ago.