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Full Discussion: Sorting file content by file extensions
Homework and Emergencies Emergency UNIX and Linux Support Sorting file content by file extensions Post 302639495 by otheus on Saturday 12th of May 2012 12:24:57 AM
Old 05-12-2012
I thought of two better ways to do this.

First, you can use the traditional sort, and this will work fine for 99% of the cases:
Code:
ls -1 | sort -t. -k 3,3 -k 2,2 -k 1,1

You tell sort to order by the 3rd extension, then the 2nd, then the 1st... and sort ignores non-existent fields. The only problem with this sort method is that you get this kind of weird ordering:

Code:
bar
foo
bar.zip
foo.zip
foo.bar.jpg
foo.bar.zip
bar.foo.zip

That is, fields with more than 1 extension have higher sorting precedence than fields with two. So the two zip files seem out-of-place.


So for the best ordering -- the one most likely to be expected, you make the last extension "special" by inserting a special character before the final period. Then sort, then remove the special character. You can use path-separators because those are never part of the filename.
Code:
ls -1 | sed 's/\(\.[^.]*\)$/\/\1/' | sort -t/ -k 2,2 -k 1,1  |  sed 's/\/\([^/]*\)$/\1/'

I'll admit: That's ugly for the command line. It could be a bit nicer if you don't need to worry about full path-names in your list.


Postscript: On Linux, you can find the "rev" command with the util-linux suite. It prints out each line in the file in reverse, so you can use drl's technique in that environment:

Code:
ls -1 | rev | sort | rev

 

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LEARN ABOUT SUSE

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 2.4.21 						    2009/12/20							  SLAPO-VALSORT(5)
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