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Full Discussion: How to generate the list?
Top Forums Shell Programming and Scripting How to generate the list? Post 302408739 by drl on Tuesday 30th of March 2010 10:12:29 AM
Old 03-30-2010
Hi.

I think you are looking for permutations: Permutation - Wikipedia, the free encyclopedia -- one method is:
Code:
#!/usr/bin/perl

# @(#) p5	Demonstrate permutations of strings.

use Math::Combinatorics;
use strict;
use warnings;

my ($word) = shift || die(" Must supply a word.\n");
my (@n) = split "", $word;
print " Working on $word, broken apart as \"@n\"\n\n";

print join( "\n", map { join "", @$_ } permute(@n) ), "\n";
print "\n";

producing in one instance:
Code:
./p5 abc
 Working on abc, broken apart as "a b c"

abc
acb
bac
bca
cab
cba

and with a replicated letter:
Code:
./p5 abb
 Working on abb, broken apart as "a b b"

abb
abb
bab
bba
bab
bba

which means that you may get duplicates from "expect" because there are two instances of "e". You could use sort -u to get rid of those if you don't want them ... cheers, drl
 

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escape(1)							Mail Avenger 0.8.3							 escape(1)

NAME
escape - escape shell special characters in a string SYNOPSIS
escape string DESCRIPTION
escape prepends a "" character to all shell special characters in string, making it safe to compose a shell command with the result. EXAMPLES
The following is a contrived example showing how one can unintentionally end up executing the contents of a string: $ var='; echo gotcha!' $ eval echo hi $var hi gotcha! $ Using escape, one can avoid executing the contents of $var: $ eval echo hi `escape "$var"` hi ; echo gotcha! $ A less contrived example is passing arguments to Mail Avenger bodytest commands containing possibly unsafe environment variables. For example, you might write a hypothetical reject_bcc script to reject mail not explicitly addressed to the recipient: #!/bin/sh formail -x to -x cc -x resent-to -x resent-cc | fgrep "$1" > /dev/null && exit 0 echo "<$1>.. address does not accept blind carbon copies" exit 100 To invoke this script, passing it the recipient address as an argument, you would need to put the following in your Mail Avenger rcpt script: bodytest reject_bcc `escape "$RECIPIENT"` SEE ALSO
avenger(1), The Mail Avenger home page: <http://www.mailavenger.org/>. BUGS
escape is designed for the Bourne shell, which is what Mail Avenger scripts use. escape might or might not work with other shells. AUTHOR
David Mazieres Mail Avenger 0.8.3 2012-04-05 escape(1)
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