Question

在bash脚本中，如果我想删除目录中超过15天的文件，我可以运行：

find "$DIR" -type f -mtime +15 -exec rm {} \;

有人可以帮助我使用bash脚本删除目录中超过15个月的文件吗？

这与Bash中的ctime相同吗？

Answer 1

根据手册页：

 -mtime n[smhdw]
         If no units are specified, this primary evaluates to true if the difference between the file last modification time and the time find was started, rounded up to the next
         full 24-hour period, is n 24-hour periods.

         If units are specified, this primary evaluates to true if the difference between the file last modification time and the time find was started is exactly n units.  Please
         refer to the -atime primary description for information on supported time units.

然后，在-atime：

 -atime n[smhdw]
         If no units are specified, this primary evaluates to true if the difference between the file last access time and the time find was started, rounded up to the next full
         24-hour period, is n 24-hour periods.

         If units are specified, this primary evaluates to true if the difference between the file last access time and the time find was started is exactly n units.  Possible
         time units are as follows:

         s       second
         m       minute (60 seconds)
         h       hour (60 minutes)
         d       day (24 hours)
         w       week (7 days)

         Any number of units may be combined in one -atime argument, for example, ``-atime -1h30m''.  Units are probably only useful when used in conjunction with the + or - modi-
         fier.

所以我们有几个星期。 15个月* 4周/月= 60周。

find $DIR -type f -mtime +60w -exec rm {} \;

Answer 2

使用450（= 15 * 30）作为-mtime参数。

find $DIR -type f -mtime +450 -exec rm {} \;

Answer 3

一个有趣的可能性：您可以touch一个带有时间戳15 months ago的tmp文件，并将其与-newer的{否定的} find标记一起使用：

a=$(mktemp)
touch -d '15 months ago' -- "$a"
find "$DIR" -type f \! -newer "$a" -exec rm {} +
rm -- "$a"

当然，这假定您的touch和find具备这些功能。

如果mktemp有可能在您的目录$DIR的子目录中创建文件，它将变得非常混乱，因为“$ a”引用的文件可能会在结束之前被删除处理。在这种情况下，要100％确定，请使用（否定的）-samefile测试：

find "$DIR" -type f \! -newer "$a" \! -samefile "$a" -exec rm {} +

如果-delete支持find，您当然可以使用find a=$(mktemp) touch -d '15 months ago' -- "$a" find "$DIR" -type f \! -newer "$a" \! -samefile "$a" -delete rm -- "$a"命令。这会给：

{{1}}

Answer 4

http://linux.die.net/man/8/tmpwatch专为此应用而设计。通常与cron一起使用。

Bash脚本可删除超过15个月的文件

4 个答案: