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To sort in ascending order of bytes
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bash-3.2# ls -l | sort -nk5
dr-xr-xr-x 1 root root 1 Feb 18 22:09 home
dr-xr-xr-x 1 root root 1 Feb 18 22:09 net
drwxr-xr-x 2 root root 2 Mar 22 2013 Documents
drwxr-xr-x 2 root root 2 Mar 22 2013 rpool
drwxr-xr-x 3 root sys 3 Mar 22 2013 export
drwxr-xr-x 3 root sys 3 Mar 26 2014 mnt
drwxr-xr-x 4 root root 4 Mar 22 2013 system
drwxr-xr-x 4 root nobody 5 Aug 17 2014 cdrom
drwxr-xr-x 5 root sys 5 Mar 22 2013 platform
drwxrwxr-x 5 root other 5 Apr 27 2014 app
drwxr-xr-x 2 root root 9 Apr 27 2014 Desktop
.....
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To sort in descending order of bytes
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bash-3.2# ls -l | sort -nrk 5
dr-xr-xr-x 86 root root 437952 Feb 18 22:17 proc
drwxrwxrwt 8 root sys 671 Feb 18 22:11 tmp
dr-xr-xr-x 6 root root 512 Feb 18 22:09 vol
drwxr-xr-x 19 root sys 330 Feb 18 22:09 dev
drwxr-xr-x 87 root sys 250 Feb 18 22:09 etc
drwxr-xr-x 8 root bin 243 Mar 24 2014 lib
drwxr-xr-x 41 root sys 55 Mar 26 2014 usr
drwxr-xr-x 2 root sys 54 Mar 22 2013 sbin
drwxr-xr-x 49 root sys 49 Mar 26 2014 var
.....
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-n => key treated as numeric value
-r => reverse order
-k => column number of the sort key in this case size of the file in bytes
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