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Full Discussion: Save output of updated csv file as csv file itself
Top Forums Shell Programming and Scripting Save output of updated csv file as csv file itself Post 302939938 by Don Cragun on Tuesday 31st of March 2015 05:29:11 AM
Old 03-31-2015
Sorry, I didn't notice the heading line before. Doing a numeric sort, the string DateTimeOriginal evaluates to 0 and sorts before 2015; while doing an alphanumeric sort, numbers sort before letters. So, you need the -n option to make the heading come out first. If you use numeric sorting, you need to make the sort key more complex to use the each year, month, day, hour, minute, and second field separate keys to avoid just using the year as your sort key:
Code:
sort -n -k2.1,2.4 -k2.6,2.7 -k2.9,2.10 -k2.12,2.13 -k2.15,2.1 -k2.18,2.19 -o test.csv -t, test.csv

But with your data we can use numeric sorting for the year and use alphanumeric sorting for the month, day, hour, minute and second as a single field, which siimplifies the command to just:
Code:
sort -k2.1,2.4n -k2.6,2 -o test.csv -t, test.csv

Your relatively simple sort seems to work because the image numbers in your pathnames are monotonically increasing as the time stamp increases AND all of your image files are in a single directory. If your real image files could be in more than one directory, might have different numbers of digits in the sequence numbers, or might come from different cameras with different image ranges, one of the above sort commands should sort correctly by date and time for you.
This User Gave Thanks to Don Cragun For This Post:
refrain
 

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LEARN ABOUT MOJAVE

slapo-valsort

SLAPO-VALSORT(5)						File Formats Manual						  SLAPO-VALSORT(5)

NAME

       slapo-valsort - Value Sorting overlay to slapd

SYNOPSIS

       /etc/openldap/slapd.conf

DESCRIPTION

       The  Value Sorting overlay can be used with a backend database to sort the values of specific multi-valued attributes within a subtree. The
       sorting occurs whenever the attributes are returned in a search response.

       Sorting can be specified in ascending or descending order, using either numeric or alphanumeric sort methods.  Additionally,  a	"weighted"
       sort  can  be specified, which uses a numeric weight prepended to the attribute values.	The weighted sort is always performed in ascending
       order, but may be combined with the other methods for values that all have equal weights. The weight is specified by prepending an  integer
       weight  {<weight>} in front of each value of the attribute for which weighted sorting is desired. This weighting factor is stripped off and
       never returned in search results.

CONFIGURATION

       These slapd.conf options apply to the Value Sorting overlay.  They should appear after the overlay directive.

       valsort-attr <attribute> <baseDN> (<sort-method> | weighted [<sort-method>])
	      Configure a sorting method for the specified attribute in the subtree rooted at baseDN.  The sort-method may be one of alpha-ascend,
	      alpha-descend, numeric-ascend, or numeric-descend.  If the special weighted method is specified, a secondary sort-method may also be
	      specified. It is an error to specify an alphanumeric sort-method for an attribute with Integer or NumericString syntax, and it is an
	      error to specify a numeric sort-method for an attribute with a syntax other than Integer or NumericString.

EXAMPLES

	    database bdb
	    suffix dc=example,dc=com
	    ...
	    overlay valsort
	    valsort-attr member ou=groups,dc=example,dc=com alpha-ascend

FILES

       /etc/openldap/slapd.conf
	      default slapd configuration file

SEE ALSO

       slapd.conf(5), slapd-config(5).

ACKNOWLEDGEMENTS

       This module was written in 2005 by Howard Chu of Symas Corporation. The work was sponsored by Stanford University.

OpenLDAP 2.4.28 						    2011/11/24							  SLAPO-VALSORT(5)
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