Dear fellow Monks,
the standard *nix command strings returns a list of printable strings from an input file.
I want to make an enhanced version of that command, returning only the words (not strings) that appear more than once.

I came up with this code:

#!/usr/bin/perl -n
END{print map{$s{$_}>1?"$s{$_}\t$_$/":""}keys%s}$s{$1}++while/(\w{4,}\
+b)/g
[download]

76 characters. Not bad for a short script. Too long if I want to make it a one-liner.
I gave myself a few rules:

• The script should work with Perl 5.6.1;
• The script should output only the words that appear more than once;
• One string per line;
• No modules. I need it to work in any platform, without rushing to the CPAN;
• No system calls;
• The output should be tab-separated and sortable through the standard sort command;
• Only sequences of 4 or more printable characters should be returned;

The above script, executed as

perl strings.pl `which perl` | sort -rn
[download]

will return:

15      DynaLoader
6       Usage
4       UWVS
2       dl_unload_file
2       dl_undef_symbols
2       version
2       dl_install_xsub
2       GLIBC_2
2       boot_DynaLoader
2       dl_find_symbol
2       filename
2       linux
2       dl_error
2       dl_load_file
[download]

Any suggestions to shorten it?

TIA

update Please notice that the output of 'strings' is a stream of printable characters (could be a word or several space-separated words), while I am interested in getting the unique words only.

 _  _ _  _  
(_|| | |(_|><
 _|   

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