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Full Discussion: find file older than one month not by x days olds
Top Forums Shell Programming and Scripting find file older than one month not by x days olds Post 302578995 by agama on Saturday 3rd of December 2011 04:22:51 PM
Old 12-03-2011
The -mtime flag on the find command refers to the last modification time of a file as it is examined. So, -mtime +30 will be true if the file's modification time is more than 30 days old. There is one subtle 'feature' that most people do not realise. Using n days means from the current time. So if the command is being run at noon local time, files will show up meeting the criteria based on noon, not a 24 hour clock starting at midnight.

When using find to identify files by age, I prefer to touch a file with a specific time stamp (see the touch man page for details). Then I run find to identify any files that are older than the given 'marker' file. This allows me to specify a specific date and not worry about current time or the number of days in the month if I want to delete based on month boundaries.

Hope this helps.
 

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LEARN ABOUT SUNOS

touch

touch(1B)					     SunOS/BSD Compatibility Package Commands						 touch(1B)

NAME

       touch - change file access and modification times

SYNOPSIS

       /usr/ucb/touch [-acfm] file...

DESCRIPTION

       touch sets the access and modification times of each file to the current time. file is created if it does not already exist.

OPTIONS

       -a	Change the access time of file. Do not change the modification time unless -m is also specified.

       -c	Do not create file if it does not exist.

       -f	Attempt to force the touch in spite of read and write permissions on file.

       -m	Change the modification time of file. Do not change the access time unless -a is also specified.

USAGE

       See largefile(5) for the description of the behavior of touch when encountering files greater than or equal to 2 Gbyte ( 2**31 bytes).

EXIT STATUS

       The following exit values are returned:

       0	touch executed successfully and all requested changes were made.

       >0	An error occurred. touch returns the number of files for which the times could not be successfully modified.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWscpu			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       touch(1), attributes(5), largefile(5)

SunOS 5.10							    26 Oct 1995 							 touch(1B)
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