COMMAND（psort）

psort(USP)

Name

psort : Partial Sort

Synopsis

Usage : psort ref=<ref> key=<key> <file>

Options : -e

-s<c>

--stable

Version : Tue Jan 9 09:02:34 JST 2024

Edition : 4

Description

Sorts the <key> field for all records that have the same value in

the <ref> field. It sorts in small chunks so it is much faster than

sorting the entire file. <key> and <ref> designates the field

position as fllows:

single field 2 the 2nd field

NF the last field

NF-1 the field just before the last field

contiguous fields 2/4 from the 2nd field to the 4th field

4/2 from the 4th field to the 2nd field

NF-3/NF from NF-3 field to the NF field

combination 2@NF the 2nd field and the NF field

There is no limit on the length of the key field or on the number

of key fields. The key field can also contain multi-byte characters

such as Japanese.

If you specify "r" as sort method after the field position, the

values will be sorted in descending order. If you specify "n" as

sort method after the field position, that field's values will be

sorted as numbers. If you specify "nr" as sort method after the

field, the values will be sorted in descending order as numbers. If

you specify sort method before or after the "/", you must use the

same sort method for both fields.

2n/5n OK

2n/5nr Error

2n/5r Error

When you specify "e" as sort method or specify -e ootion and no

method, characters in the field are replaced as follows and compared

as string:

_ ==> 0x20 (space)

\0 ==> 0x00 (null)

\t ==> 0x09 (tab stop)

\n ==> 0x0a (new line)

\r ==> 0x0d (carrige return)

\_ ==> 0x5f (underscore)

\\ ==> 0x5c (back slash)

If the file name is omitted or if it is specified as "-" then the

command will read from standard input.

The character "_" repalces by space can be chaned by -s<c> option.

Example 1

$ cat data

A B 1

A A 2

A E 3

A C 4

A D 5

B B 1

B A 2

B E 3

B C 4

B D 5

$ psort ref=1 key=2 data