Description:
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I use the next command
+---------------
if (system("/usr/bin/htpasswd -b /home/var/key_file $user1 $clave1")) {
echo "Update File"; } else {
echo "Error !!"; }
+-----------------
This work very good in other system (RedHat 7.2), but don't understand why don't work in my new server Linux Redhat ver 9.0 with PHP 4.2.2 and Apache 2.0.

Reproduce code:
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if (system("/usr/bin/htpasswd -b /home/var/key_file $user1 $clave1")) {
echo "Update File"; } else {
echo "Error !!"; }

Expected result:
----------------
Print in the screen "Update File"

Actual result:
--------------
Print in the screen "Error"