psort - a perl-enhanced sort
psort [OPTION]... [FILE]...
A perl-enhanced variant of sort(1). The specified files (or standard input) are written sorted to standard output.
By default, sorting is done using perl's cmp operator, without any use of locales or encodings.
Ignore any whitespace character (\s) at the beginning of a line.
\s
Do not output anything. Just check if the input is sorted and return the exit value 0 for sorted and 1 for unsorted.
Sort using a custom perl function. For your convenience, the enclosing "sub {" and "}" must not be specified. Like in perl's sort, the variables $a and $b are available.
$a
$b
Examples
Reimplementing the -n switch:
-n
-C '$a <=> $b'
Using locale comparisons:
-C 'use locale; $a cmp $b'
Note that it is possible to put BEGIN { ... } blocks into the comparison function.
BEGIN { ... }
Extract the sorting field (or the sorting key) using a custom perl function. For your convenience, the enclosing "sub {" and "}" must not be specified. The current line is available in the variable $_. It is expected that the last expression is the field to be used for comparisons.
$_
Examples:
Using just the identity:
-e '$_'
Using only the first four characters for comparisons:
-e 'substr($_, 0, 4)'
Using a regular expression:
-e '/(\d+) wallclock/ && $1'
Fold all characters to its uppercased version for comparison.
Ignore non-printing characters (everything matching the [[:^print]] character class) for comparison.
[[:^print]]
Load a perl module. The syntax is the same like perl's -M option.
-M
Load a perl module without default import. The syntax is the same like perl's -M option.
Sort numerically. It is using perl's <=> operator.
Sort using Sort::Naturally, if available.
Reverse the result of comparisons.
Print psort's version.
Sort versions using CPAN::Version, if available.
Some options found in GNU/POSIX sort are also available in psort. But no attempt was done to make psort compatible to GNU/POSIX sort. Especially there's no locale support (but see above how to use locale in the -C option). There's also no encoding support (though it probably can be emulated by using <Encode/decode in the -e or -C option).
use locale
-C
<Encode/decode
-e
Here are some ideas for future options:
--encoding
Specify the input and output encoding.
An option to use Unicode::Collate.
Currently the longish one-liner has to be used:
psort -MUnicode::Collate -MEncode=decode -e 'decode("utf-8", $_)' -C 'BEGIN { $Collator = Unicode::Collate->new } $Collator->cmp($a,$b)'
--locale
Specify a locale.
-o
Instead writing to standard output, write to the specified output file.
-m
Assume that input files are already sorted.
-u
Output only unique lines.
Slaven Rezić
Copyright (C) 2009,2011,2013 by Slaven Rezić
This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself, either Perl version 5.8.8 or, at your option, any later version of Perl 5 you may have available.
sort(1), Sort::Naturally, CPAN::Version.
To install App::psort, copy and paste the appropriate command in to your terminal.
cpanm
cpanm App::psort
CPAN shell
perl -MCPAN -e shell install App::psort
For more information on module installation, please visit the detailed CPAN module installation guide.