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Top Forums UNIX for Advanced & Expert Users tmpwatchc updates directory ctime? Post 302577386 by password636 on Tuesday 29th of November 2011 02:16:37 AM
Old 11-29-2011
tmpwatchc updates directory ctime?

Hi,

I noticed that some directories under /tmp were updated ctime daily. As you can see below, I thought that was because of tmpwatch.
Code:
[root@localhost ~]# cat /etc/crontab
SHELL=/bin/bash
PATH=/sbin:/bin:/usr/sbin:/usr/bin
MAILTO=root
HOME=/

# run-parts
01 * * * * root run-parts /etc/cron.hourly
02 4 * * * root run-parts /etc/cron.daily
22 4 * * 0 root run-parts /etc/cron.weekly
42 4 1 * * root run-parts /etc/cron.monthly
[root@localhost ~]# ls /etc/cron.daily/
0anacron  0logwatch  cups  logrotate  makewhatis.cron  mlocate.cron  prelink  rpm  tmpwatch
[root@localhost ~]# ls -lc /tmp
total 44
drwx------ 3 root root 4096 Nov 10 11:15 gconfd-root
drwx------ 2 root root 4096 Nov 10 11:15 keyring-qFRB6k
srwxr-xr-x 1 root root    0 Nov 10 11:16 mapping-root
drwx------ 2 root root 4096 Nov 10 11:16 orbit-root
drwx------ 2 root root 4096 Nov 10 11:15 ssh-rAIQTP2769
drwx------ 2 root root 4096 Nov 10 11:16 virtual-root.X9XGxG
[root@localhost ~]# date
Thu Nov 10 11:17:14 CST 2011
[root@localhost ~]# /etc/cron.daily/tmpwatch
[root@localhost ~]# ls -lc /tmp
total 44
drwx------ 3 root root 4096 Nov 10 11:17 gconfd-root
drwx------ 2 root root 4096 Nov 10 11:17 keyring-qFRB6k
srwxr-xr-x 1 root root    0 Nov 10 11:16 mapping-root
drwx------ 2 root root 4096 Nov 10 11:17 orbit-root
drwx------ 2 root root 4096 Nov 10 11:17 ssh-rAIQTP2769
drwx------ 2 root root 4096 Nov 10 11:17 virtual-root.X9XGxG
[root@localhost ~]#

But how come tmpwatch updates directory ctime? Even if there is no file deleted under that directory:
Code:
[root@localhost ~]# ls -lc
total 92
drwxr-xr-x 2 root root  4096 Nov 28 13:26 Desktop
-rw------- 1 root root  1414 Feb  3  2010 anaconda-ks.cfg
-rw-r--r-- 1 root root 51009 Feb  3  2010 install.log
-rw-r--r-- 1 root root  3696 Feb  3  2010 install.log.syslog
drwxr-xr-x 2 root root  4096 Nov 28 13:33 test
[root@localhost ~]# ls test
file
[root@localhost ~]# ls test/file  -lc
-rw-r--r-- 1 root root 0 Nov 28 13:30 test/file
[root@localhost ~]# date
Mon Nov 28 14:00:17 CST 2011
[root@localhost ~]# /usr/sbin/tmpwatch -umc 1 /root/test
[root@localhost ~]# ls -lc
total 92
drwxr-xr-x 2 root root  4096 Nov 28 13:26 Desktop
-rw------- 1 root root  1414 Feb  3  2010 anaconda-ks.cfg
-rw-r--r-- 1 root root 51009 Feb  3  2010 install.log
-rw-r--r-- 1 root root  3696 Feb  3  2010 install.log.syslog
drwxr-xr-x 2 root root  4096 Nov 28 14:00 test
[root@localhost ~]# ls test/file  -lc
-rw-r--r-- 1 root root 0 Nov 28 13:30 test/file
[root@localhost ~]#

The file "/root/test/file" does not change, but "/root/test" gets updated ctime. Why?

THANKS
 

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TMPWATCH(8)						   System Administrator's Manual					       TMPWATCH(8)

NAME
tmpwatch - removes files which haven't been accessed for a period of time SYNOPSIS
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] time dirs DESCRIPTION
tmpwatch recursively removes files which haven't been accessed for a given time. Normally, it's used to clean up directories which are used for temporary holding space such as /tmp. When changing directories, tmpwatch is very sensitive to possible race conditions and will exit with an error if one is detected. It does not follow symbolic links in the directories it's cleaning (even if a symbolic link is given as its argument), does not switch filesystems (including non-trivial bind mounts), skips lost+found directories owned by the root user, and only removes empty directories, regular files, symbolic links, and on some systems also unused sockets. 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. If the --atime, --ctime or --mtime options are used in combination, the decision about deleting a file will be based on the maximum of these times. The --dirmtime option implies ignoring atime of directories, even if the --atime option is used. The time parameter defines the threshold for removing files. If the file has not been accessed for time, the file is removed. The time argument is a number with an optional single-character suffix specifying the units: m for minutes, h for hours, d for days. If no suffix is specified, time is in hours. Following this, one or more directories may be given for tmpwatch to clean up. OPTIONS
-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. -M, --dirmtime Make the decision about deleting a directory based on the directory's mtime (modification time) instead of the atime; completely ignore atime for directories. -a, --all Remove all file types, not just regular files, symbolic links and directories. On systems where tmpwatch can remove unused sockets, make the decision only based on file times, ignoring possible use of the socket. -d, --nodirs Do not attempt to remove directories, even if they are empty. -f, --force Remove root-owned files even if root doesn't have write access (akin to rm -f). -l, --nosymlinks Do not attempt to remove symbolic links. -q, --quiet Report only fatal errors. -s, --fuser Attempt to use the "fuser" command to see if a file is already open before removing it. Not enabled by default. Does help in some circumstances, but not all. Dependent on fuser being installed in /sbin. Not supported on HP-UX or Solaris. -t, --test Don't remove files, but go through the motions of removing them. This implies -v. -U, --exclude-user=user Don't remove files owned by user, which can be an user name or numeric user ID. -v, --verbose Print a verbose display. Two levels of verboseness are available -- use this option twice to get the most verbose output. -x, --exclude=path Skip path; if path is a directory, all files contained in it are skipped too. If path does not exist, it must be an absolute path that contains no symbolic links. -X, --exclude-pattern=pattern Skip paths matching pattern; if a directory matches pattern, all files contained in it are skipped too. pattern must match an abso- lute path that contains no symbolic links. SEE ALSO
cron(1), ls(1), rm(1), fuser(1) AUTHORS
Erik Troan <ewt@redhat.com> Preston Brown <pbrown@redhat.com> Nalin Dahyabhai <nalin@redhat.com> Miloslav Trmac <mitr@redhat.com> 4th Berkeley Distribution 2009-10-15 TMPWATCH(8)
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