There may not be one that exists, but it's pretty easy to do I think.
If users.txt is just "username (WHITESPACE) password"
#!/bin/sh
for USER in `cat users.txt | awk '{ print $1 }'`; do
  PASSWORD=`grep "^$USER" users.txt | head -1 | awk '{ print $2 }'`
  /usr/local/apache/bin/htpasswd -b /path/to/.htpasswd $USER $PASSSWORD
done
Or cat it to this perl script:
#!/usr/bin/perl5
while (<>) {
  ($user, $password) = split;
  system("/usr/local/apache/bin/htpasswd -b 
  /path/to/.htpasswd $user $password)";
}
If your version of htpasswd can't take a password on the command line, you
can generate them on the fly with perl, and then add the output to the end
of the existing .htpasswd file.
#!/usr/bin/perl5
while (<>) {
  ($user, $password) = split;
  $salt = join '',('.','/',0..9,'A'..'Z','a'..'z')[rand 64, rand 64];
  $encrypted_password = crypt($password, $salt);
  print "$user:$encrypted_password\n";
}
I just typed these in - so test first before committing any changes.  No
guarantees they work!
Adam Maloney
Perl Monger :)
On Fri, 2 May 2003, Raymond Norton wrote:
> I am setting up an IPCop box basically as squid box using proxy_auth.
> Is there a script I can drop in the html folder that will let an
> administrator add web users via a web page, or is there was a way to
> import a txt file with 200 users and passwords?
> 
> 
> Raymond
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