List the directories, having given pattern in the directories name, sorted by creation date Post: 302802803

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Top Forums UNIX for Dummies Questions & Answers List the directories, having given pattern in the directories name, sorted by creation date Post 302802803 by Don Cragun on Sunday 5th of May 2013 12:21:31 AM

05-05-2013

Registered User

Most UNIX Systems do not keep track of the creation date of a file (only the last access time, the last (data) modification time, and the last status modification time timestamps are specified by the standards). Sorting by ls (with the -t option and without the -S, -c, and -m options) sorts by increasing data modification time. But, as I'm sure you've noticed from the output in your examples, anything with a date in the future and anything with a date more than six months old will print the month, day, and year of the date while dates within the last six months will be printed with the month, day, and time of day (in 24 hour format).

So the command:

Code:

ls -ldt pkg3[23]* | grep '^d'

will give you the list of directories in the current directory matching the patterns you want sorted by increasing timestamp and the command:

Code:

ls -lrdt pkg3[23]* | grep '^d'

will give you the same list sorted in reverse order.

But, neither of these will print the date in MM/DD/YYYY format.

Does HP/UX B.11.31 include a stat utility?

Do you just want directories located in the current directory, or do you also want to process subdirectories with matching names?

Do any of your directory names contain one or more space or tab characters? Do any of your directory names contain one or more newline characters? If the answer to both of these is no, there are several simplifying assumptions we can make.

Is MM/DD/YYYY format a requirement or a nice-to-have feature? If it is a requirement and your system doesn't have a stat utility, would you rather have a complicated shell script or a relatively simple C program?

Don Cragun

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LEARN ABOUT NETBSD

touch

TOUCH(1)						    BSD General Commands Manual 						  TOUCH(1)

NAME

     touch -- change file access and modification times

SYNOPSIS

     touch [-acfhm] [-r file] [-t [[CC]YY]MMDDhhmm[.SS]] file ...

DESCRIPTION

     The touch utility sets the modification and access times of files to the current time of day.  If the file doesn't exist, it is created with
     default permissions.

     The following options are available:

     -a      Change the access time of the file.  The modification time of the file is not changed unless the -m flag is also specified.

     -c      Do not create the file if it does not exist.  The touch utility does not treat this as an error.  No error messages are displayed and
	     the exit value is not affected.

     -f      This flag has no effect; it is accepted for compatibility reasons.

     -h      If file is a symbolic link, access and/or modification time of the link is changed.  This option implies -c.

     -m      Change the modification time of the file.	The access time of the file is not changed unless the -a flag is also specified.

     -r      Use the access and modifications times from the specified file instead of the current time of day.

     -t      Change the access and modification times to the specified time.  The argument should be in the form ``[[CC]YY]MMDDhhmm[.SS]'' where
	     each pair of letters represents the following:

		   CC	   The first two digits of the year (the century).
		   YY	   The second two digits of the year.  If ``YY'' is specified, but ``CC'' is not, a value for ``YY'' between 69 and 99
			   results in a ``CC'' value of 19.  Otherwise, a ``CC'' value of 20 is used.
		   MM	   The month of the year, from 1 to 12.
		   DD	   The day of the month, from 1 to 31.
		   hh	   The hour of the day, from 0 to 23.
		   mm	   The minute of the hour, from 0 to 59.
		   SS	   The second of the minute, from 0 to 61.

	     If the ``CC'' and ``YY'' letter pairs are not specified, the values default to the current year.  If the ``SS'' letter pair is not
	     specified, the value defaults to 0.

     The touch utility exits 0 on success, and >0 if an error occurs.

COMPATIBILITY

     The obsolescent form of touch, where a time format is specified as the first argument, is supported.  When no -r or -t option is specified,
     there are at least two arguments, and the first argument is a string of digits either eight or ten characters in length, the first argument
     is interpreted as a time specification of the form ``MMDDhhmm[YY]''.

     The ``MM'', ``DD'', ``hh'' and ``mm'' letter pairs are treated as their counterparts specified to the -t option.  If the ``YY'' letter pair
     is in the range 69 to 99, the year is set to 1969 to 1999, otherwise, the year is set in the 21st century.

SEE ALSO

     utimes(2)

STANDARDS

     The touch utility is expected to be a superset of the IEEE Std 1003.2 (``POSIX.2'') specification.

HISTORY

     A touch utility appeared in Version 7 AT&T UNIX.

BUGS

     A symbolic link can't be a reference file of access and/or modification time.

BSD
								 February 22, 2011							       BSD

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