在 FreeBSD UFS / MacOS X HFS 下更改文件的 ctime
Change ctime of file under FreeBSD UFS / MacOS X HFS
我正在寻找一种在不同文件系统上使用旧 ctime 创建文件的方法。
在 Linux 分机上,这是通过使用
实现的
touch /path/to/file
debugfs -w -R 'set_inode_field /path/to/file ctime 201001010101' /dev/sdX
echo 3 > /proc/sys/vm/drop_caches
FreeBSD 的 UFS 上是否有任何等效项?
甚至可能在 MacOSX HFS+ 上?
在 FreeBSD 上,使用 -f
选项的 touch 命令可能适用于此,例如:
touch -t 0510242022.13 file
将日期设置为 2005 年,11 月 24 日 20:22:13
格式为[[CC]YY]MMDDhhmm[.SS]
,来自man touch
:
-t Change the access and modification times to the specified time
instead of the current time of day. The argument is of the form
``[[CC]YY]MMDDhhmm[.SS]'' where each pair of letters represents
the following:
CC The first two digits of the year (the century).
YY The second two digits of the year. If ``YY'' is
specified, but ``CC'' is not, a value for ``YY''
between 69 and 99 results in a ``CC'' value of 19.
Otherwise, a ``CC'' value of 20 is used.
MM The month of the year, from 01 to 12.
DD the day of the month, from 01 to 31.
hh The hour of the day, from 00 to 23.
mm The minute of the hour, from 00 to 59.
SS The second of the minute, from 00 to 61.
要更改 ctime,您可以使用 fsdb,可能您需要以单模式启动以使磁盘处于只读模式,示例:
> fsdb /dev/vtbd0p2
** /dev/vtbd0p2 (NO WRITE)
Editing file system `/dev/vtbd0p2'
Last Mounted on /
current inode: directory
I=2 MODE=40755 SIZE=1024
BTIME=Sep 29 01:45:50 2016 [0 nsec]
MTIME=Nov 26 09:47:37 2016 [339135000 nsec]
CTIME=Nov 26 09:47:37 2016 [339135000 nsec]
ATIME=Nov 26 09:28:38 2016 [679268000 nsec]
OWNER=root GRP=wheel LINKCNT=20 FLAGS=0 BLKCNT=8 GEN=37b9b524
fsdb (inum: 2)>
从那里我可以 cd 到目录,然后 select 它:
fsdb (inum: 2)> cd /usr/home/nbari
和
fsdb (inum: 644816)> lookup file
您可以键入 active
来仔细检查文件,例如:
fsdb (inum: 642101)> active
current inode: regular file
I=642101 MODE=100644 SIZE=29
BTIME=Oct 24 20:22:13 2005 [0 nsec]
MTIME=Jan 1 12:12:12 2012 [0 nsec]
CTIME=Jan 1 12:12:12 2012 [0 nsec]
ATIME=Jan 1 12:12:12 2012 [0 nsec]
OWNER=nbari GRP=nbari LINKCNT=1 FLAGS=0 BLKCNT=8 GEN=384445f7
稍后只需将 ctime 更改为您想要的日期:
fsdb (inum: 642101)> ctime 20121212010101
格式为YYYYMMDDHHMMSS[.nsec]
然后输入 q
或 exit
退出,再次检查 运行 stat
,例如:
> stat -x test_file
File: "test_file"
Size: 29 FileType: Regular File
Mode: (0644/-rw-r--r--) Uid: ( 1002/ nbari) Gid: ( 1002/ nbari)
Device: 0,68 Inode: 642101 Links: 1
Access: Sun Jan 1 12:12:12 2012
Modify: Sun Jan 1 12:12:12 2012
Change: Sun Jan 1 12:12:12 2012
我正在寻找一种在不同文件系统上使用旧 ctime 创建文件的方法。 在 Linux 分机上,这是通过使用
实现的touch /path/to/file
debugfs -w -R 'set_inode_field /path/to/file ctime 201001010101' /dev/sdX
echo 3 > /proc/sys/vm/drop_caches
FreeBSD 的 UFS 上是否有任何等效项? 甚至可能在 MacOSX HFS+ 上?
在 FreeBSD 上,使用 -f
选项的 touch 命令可能适用于此,例如:
touch -t 0510242022.13 file
将日期设置为 2005 年,11 月 24 日 20:22:13
格式为[[CC]YY]MMDDhhmm[.SS]
,来自man touch
:
-t Change the access and modification times to the specified time
instead of the current time of day. The argument is of the form
``[[CC]YY]MMDDhhmm[.SS]'' where each pair of letters represents
the following:
CC The first two digits of the year (the century).
YY The second two digits of the year. If ``YY'' is
specified, but ``CC'' is not, a value for ``YY''
between 69 and 99 results in a ``CC'' value of 19.
Otherwise, a ``CC'' value of 20 is used.
MM The month of the year, from 01 to 12.
DD the day of the month, from 01 to 31.
hh The hour of the day, from 00 to 23.
mm The minute of the hour, from 00 to 59.
SS The second of the minute, from 00 to 61.
要更改 ctime,您可以使用 fsdb,可能您需要以单模式启动以使磁盘处于只读模式,示例:
> fsdb /dev/vtbd0p2
** /dev/vtbd0p2 (NO WRITE)
Editing file system `/dev/vtbd0p2'
Last Mounted on /
current inode: directory
I=2 MODE=40755 SIZE=1024
BTIME=Sep 29 01:45:50 2016 [0 nsec]
MTIME=Nov 26 09:47:37 2016 [339135000 nsec]
CTIME=Nov 26 09:47:37 2016 [339135000 nsec]
ATIME=Nov 26 09:28:38 2016 [679268000 nsec]
OWNER=root GRP=wheel LINKCNT=20 FLAGS=0 BLKCNT=8 GEN=37b9b524
fsdb (inum: 2)>
从那里我可以 cd 到目录,然后 select 它:
fsdb (inum: 2)> cd /usr/home/nbari
和
fsdb (inum: 644816)> lookup file
您可以键入 active
来仔细检查文件,例如:
fsdb (inum: 642101)> active
current inode: regular file
I=642101 MODE=100644 SIZE=29
BTIME=Oct 24 20:22:13 2005 [0 nsec]
MTIME=Jan 1 12:12:12 2012 [0 nsec]
CTIME=Jan 1 12:12:12 2012 [0 nsec]
ATIME=Jan 1 12:12:12 2012 [0 nsec]
OWNER=nbari GRP=nbari LINKCNT=1 FLAGS=0 BLKCNT=8 GEN=384445f7
稍后只需将 ctime 更改为您想要的日期:
fsdb (inum: 642101)> ctime 20121212010101
格式为YYYYMMDDHHMMSS[.nsec]
然后输入 q
或 exit
退出,再次检查 运行 stat
,例如:
> stat -x test_file
File: "test_file"
Size: 29 FileType: Regular File
Mode: (0644/-rw-r--r--) Uid: ( 1002/ nbari) Gid: ( 1002/ nbari)
Device: 0,68 Inode: 642101 Links: 1
Access: Sun Jan 1 12:12:12 2012
Modify: Sun Jan 1 12:12:12 2012
Change: Sun Jan 1 12:12:12 2012