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  • [20201112]tmpwatch 删除文件.txt

    [20201112]tmpwatch 删除文件.txt

    --//tmpwatch命令用来removes files which haven't been accessed for a period of time。
    --//一般发布版本用来通过crond调用tmpwatch删除一定时间内不使用的文件。

    # cat /etc/cron.daily/tmpwatch
    flags=-umc
    /usr/sbin/tmpwatch "$flags" -x /tmp/.X11-unix -x /tmp/.XIM-unix
            -x /tmp/.font-unix -x /tmp/.ICE-unix -x /tmp/.Test-unix
            -X '/tmp/hsperfdata_*' 240 /tmp
    /usr/sbin/tmpwatch "$flags" 720 /var/tmp
    for d in /var/{cache/man,catman}/{cat?,X11R6/cat?,local/cat?}; do
        if [ -d "$d" ]; then
            /usr/sbin/tmpwatch "$flags" -f 720 "$d"
        fi
    done

    --//flags=-umc表示
    -u, --atime
        Make the decision about deleting a file based on the file's atime (access time). This is the default.
        Note that the periodic updatedb file system scans keep the atime of directories recent.

    -m, --mtime
        Make the decision about deleting a file based on the file's mtime (modification time) instead of the atime.

    -c, --ctime
        Make the decision about deleting a file based on the file's ctime (inode change time) instead of the atime; for
        directories, make the decision based on the mtime.

    # man

     tmpwatch [-u|-m|-c] [-MUXadfqstvx] [--verbose] [--force] [--all]
                    [--nodirs] [--nosymlinks] [--test] [--fuser] [--quiet]
                    [--atime|--mtime|--ctime] [--dirmtime] [--exclude <path>]
                    [--exclude-user <user>] [--exclude-pattern <pattern>]
                    <hours> <dirs>

    --//可以使用tmpwatch <hours> <dirs> 快速删除文件。仅仅需要注意第2个参数是小时,必须换算看看。
    --//缺省默认是atime.
    By default, tmpwatch dates files by their atime (access time), not their mtime (modification time). If files aren't
    being removed when ls -l implies they should be, use ls -u to examine their atime to see if that explains the problem.

    --//建议加入-m参数。

    # tmpwatch -m [time in hours] [directory]

    --//简单测试如下:
    # mkdir -p /tmp/test
    # touch  -am -d 20100909 aaa
    # touch  -am -d 20201113 bbb

    # echo  -e "aaa bbb" | xargs -IQ stat Q
      File: `aaa'
      Size: 0               Blocks: 0          IO Block: 4096   regular empty file
    Device: 6802h/26626d    Inode: 11534342    Links: 1
    Access: (0644/-rw-r--r--)  Uid: (    0/    root)   Gid: (    0/    root)
    Access: 2010-09-09 00:00:00.000000000 +0800
    Modify: 2010-09-09 00:00:00.000000000 +0800
    Change: 2020-11-13 09:08:30.000000000 +0800
      File: `bbb'
      Size: 0               Blocks: 0          IO Block: 4096   regular empty file
    Device: 6802h/26626d    Inode: 11534343    Links: 1
    Access: (0644/-rw-r--r--)  Uid: (    0/    root)   Gid: (    0/    root)
    Access: 2020-11-13 00:00:00.000000000 +0800
    Modify: 2020-11-13 00:00:00.000000000 +0800
    Change: 2020-11-13 09:08:47.000000000 +0800

    # tmpwatch -m $((24*2)) /tmp/test
    --//表示删除2天前修改的文件。

    # ls -l /tmp/test
    total 0
    -rw-r--r-- 1 root root 0 2020-11-13 00:00:00 bbb

    --//你还可以通过-t参数先浏览看看,测试:
    # touch  -am -d 20100909 aaa
    # tmpwatch -t -m $((24*2)) /tmp/test
    removing file /tmp/test/aaa

    # tmpwatch -tv -m $((24*2)) /tmp/test
    grace period is 172800
    --//24*2*3600 = 172800 ,这个时间竟然是秒数。
    cleaning up directory /tmp/test
    removing file /tmp/test/aaa

    --//这样可以提到替换使用find命令,简单实用。
    --//另外补充一点缺省oracle并不删除链接,以及pipe,socket类型文件。如果删除许多oracle rac可能都出现问题。

    #  ls -l /tmp/.oracle/ | head
    total 0
    srwxrwx--- 1 grid   oinstall 0 2014-12-11 02:30:20 master_diskmon
    srwxr-xr-x 1 grid   oinstall 0 2014-12-11 02:30:18 mdnsd
    prw-r--r-- 1 root   root     0 2014-10-10 20:53:50 npohasd
    srwxrwxrwx 1 grid   oinstall 0 2014-12-11 02:30:26 ora_gipc_gipcd_dm01dbadm01
    srwxrwxrwx 1 grid   oinstall 0 2014-12-11 02:30:19 ora_gipc_GPNPD_dm01dbadm01
    srwxrwxrwx 1 root   root     0 2014-12-11 02:30:26 ora_gipc_sdm01dbadm01gridgxhospitalCRFM_CLIIPC
    srwxrwxrwx 1 root   root     0 2014-12-11 02:30:26 ora_gipc_sdm01dbadm01gridgxhospitalCRFM_SIPC
    srwxrwxrwx 1 oracle oinstall 0 2020-06-29 14:37:23 s#101813.1
    srwxrwxrwx 1 oracle oinstall 0 2020-06-29 14:37:23 s#101813.2

    #  tmpwatch -tv -m 24 /tmp/.oracle/
    grace period is 86400
    cleaning up directory /tmp/.oracle

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  • 原文地址:https://www.cnblogs.com/lfree/p/13967550.html
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