bash腳本文件移除舊的超過15個月

Question

在bash腳本，如果我想刪除比在目錄15天舊文件，我可以運行：

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

有人可以幫我一個bash腳本刪除目錄中超過15個月的文件？

這與Bash中的ctime相同嗎？

Answer 1

按照手冊頁：

-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. 

然後，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. 

因此，我們有幾個星期。 15個月* 4周/月= 60周。

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

Answer 2

使用450（= 15 * 30）作爲-mtime參數。

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

Answer 3

一個有趣的可能性：你可以touch時間戳15 months ago一個tmp文件，並與（否定）-newer標誌find使用它：

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

這當然，假定您touch和find具有這些功能。

如果有可能mktemp在您的目錄$DIR的子目錄中創建文件，它將變得非常混亂，因爲在過程結束之前可以刪除引用「$ a」的文件。在這種情況下，100％肯定的是，使用（否定）-samefile測試：

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

當然你也可以使用find的-delete命令，如果您find支持它。這將給：

a=$(mktemp) 
touch -d '15 months ago' -- "$a" 
find "$DIR" -type f \! -newer "$a" \! -samefile "$a" -delete 
rm -- "$a" 

Answer 4

http://linux.die.net/man/8/tmpwatch正是爲這個應用而設計的。通常與cron一起使用。