02-08-2011
What Operating System and version are you using?
How many records?
How long does the process take?
Do you have spare memory and disc space which you could give to this sort process.
If your sort has a "-o filename" parameter , use this to specify the output file not a Shell redirect (> filename). It will be much much faster.
If set, what is the value of $TMPDIR ? Can it be set to point to a fast filesystem with at least twice the space of the size of the unsorted file?
You can get a dramatic improvement in the performance of unix sort by tuning the "-y kmem" parameter. It is very important that you start with enough memory allocated to do some serious sorting on the first pass.
Off topic: If you have a database engine it is often quicker to load a large file into a database table with suitable keys, then write the file out in the required order.
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SORT(1) General Commands Manual SORT(1)
NAME
sort - sort a file of ASCII lines
SYNOPSIS
sort [-bcdfimnru] [-tc] [-o name] [+pos1] [-pos2] file ...
OPTIONS
-b Skip leading blanks when making comparisons
-c Check to see if a file is sorted
-d Dictionary order: ignore punctuation
-f Fold upper case onto lower case
-i Ignore nonASCII characters
-m Merge presorted files
-n Numeric sort order
-o Next argument is output file
-r Reverse the sort order
-t Following character is field separator
-u Unique mode (delete duplicate lines)
EXAMPLES
sort -nr file # Sort keys numerically, reversed
sort +2 -4 file # Sort using fields 2 and 3 as key
sort +2 -t: -o out # Field separator is :
sort +.3 -.6 # Characters 3 through 5 form the key
DESCRIPTION
Sort sorts one or more files. If no files are specified, stdin is sorted. Output is written on standard output, unless -o is specified.
The options +pos1 -pos2 use only fields pos1 up to but not including pos2 as the sort key, where a field is a string of characters delim-
ited by spaces and tabs, unless a different field delimiter is specified with -t. Both pos1 and pos2 have the form m.n where m tells the
number of fields and n tells the number of characters. Either m or n may be omitted.
SEE ALSO
comm(1), grep(1), uniq(1).
SORT(1)