关于一个crontab任务的说明

anline5104

各位大侠麻烦看看下面这个JOB中find /home/xkg/IpAtmSwitcher/logfiles/ -name "*.log" -mtime 7 -exec rm -rf {} \;

-name和-mtime是啥意思。为什么后面结束要加{} \这两个符号？

personball

回复 1# anline5104


    man find

1. -mtime n
   
2.               File's data was last modified n*24 hours ago.  See the  comments
   
3.               for -atime to understand how rounding affects the interpretation
   
4.               of file modification times.
   
5. 
   
6.        -name pattern
   
7.               Base of  file  name  (the  path  with  the  leading  directories
   
8.               removed)  matches  shell  pattern  pattern.   The metacharacters
   
9.               (`*', `?', and `[]') match a `.' at the start of the  base  name
   
10.               (this is a change in findutils-4.2.2; see section STANDARDS CON‐
    
11.               FORMANCE below).  To ignore a directory and the files under  it,
    
12.               use  -prune; see an example in the description of -path.  Braces
    
13.               are not recognised as being special, despite the fact that  some
    
14.               shells  including  Bash  imbue  braces with a special meaning in
    
15.               shell patterns.  The filename matching is performed with the use
    
16.               of  the  fnmatch(3)  library function.   Don't forget to enclose
    
17.               the pattern in quotes in order to protect it from  expansion  by
    
18.               the shell.
    
19. -exec command ;
    
20.               Execute  command;  true  if 0 status is returned.  All following
    
21.               arguments to find are taken to be arguments to the command until
    
22.               an  argument  consisting of `;' is encountered.  The string `{}'
    
23.               is replaced by the current file name being processed  everywhere
    
24.               it occurs in the arguments to the command, not just in arguments
    
25.               where it is alone, as in some versions of find.  Both  of  these
    
26.               constructions might need to be escaped (with a `\') or quoted to
    
27.               protect them from expansion by the shell.  See the EXAMPLES sec‐
    
28.               tion for examples of the use of the -exec option.  The specified
    
29.               command is run once for each matched file.  The command is  exe‐
    
30.               cuted  in  the starting directory.   There are unavoidable secu‐
    
31.               rity problems surrounding use of the -exec  action;  you  should
    
32.               use the -execdir option instead.
    
33. 
    

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earwig

这个就是查找７天前的.log文件，然后删除。
{}代表找到的结果。
后面的就是固定格式了。