Improve passwd change command https://github.com/webmin/webmin/pull/1477#issuecomment-825446689

1. Allow passing username as regular param
  2. Do no print verbose `Success:` on success

bin/passwd

@@ -16,10 +16,18 @@ sub main
                'config|c=s'   => \$opt{'config'},
                'user|u=s'     => \$opt{'user'},
                'password|p=s' => \$opt{'password'});
-    pod2usage(0) if ($opt{'help'} || !$opt{'user'});
 
-    $opt{'config'}   ||= "/etc/webmin";
+    # If username passed as regular param
+    my $user = scalar(@ARGV) == 1 && $ARGV[0];
 
+    # Show usage
+    pod2usage(0) if ($opt{'help'} || (!$opt{'user'} && !$user));
+
+    # Assign defaults
+    $opt{'config'} ||= "/etc/webmin";
+    $opt{'user'} = $user if ($user && !$opt{'user'});
+
+    # Catch kill signal
     my $sigkill = sub {
         system("stty echo");
         print "\n^C";
@@ -28,6 +36,7 @@ sub main
     };
     $SIG{INT} = \&$sigkill;
 
+    # Run change password command
     change_password(\%opt);
 
     return 0;
@@ -87,7 +96,7 @@ sub change_password
 
     # Check for main user file
     &$conf_check([$minserv_uconf_file]);
-    
+
     # Read and parse `miniserv.users` config file
     read_file($minserv_uconf_file, \%lusers, undef, undef, ":");
     @users = keys %lusers;
@@ -104,7 +113,7 @@ sub change_password
     }
 
     # Ask for password on stdin
-    my $suc_pre_msg = GREEN . 'Success:' . RESET;
+    my $suc_pre_msg = "";
     my $suc_msg     = 'updated successfully';
     if (!$pass) {
         print "Enter password for user ", BRIGHT_YELLOW, $user, RESET, ":";
@@ -123,7 +132,7 @@ sub change_password
         }
         chomp $pass;
         if (!$pass) {
-            $suc_pre_msg = BOLD BRIGHT_RED ON_WHITE . 'Warning:' . RESET;
+            $suc_pre_msg = BOLD BRIGHT_RED ON_WHITE . 'Warning:' . RESET . " ";
             $suc_msg     = "has been removed, enabling anyone to login without authentication";
         }
     }
@@ -142,7 +151,7 @@ sub change_password
     system("$confdif/start >/dev/null 2>&1");
 
     # Print user message
-    say "$suc_pre_msg Password for Webmin user ", BRIGHT_YELLOW, $user, RESET, " $suc_msg";
+    say "${suc_pre_msg}Password for Webmin user ", BRIGHT_YELLOW, $user, RESET, " $suc_msg";
 
     exit 0;
 }
@@ -199,6 +208,8 @@ Print this usage summary and exit.
 
 Examples of usage:
 
+ - passwd root
+
  - passwd --user root
  
  - passwd --user root --password ycwyMQRVAZY