diff --git a/orchestra/contrib/lists/backends.py b/orchestra/contrib/lists/backends.py
index 6a6bd7b4..d32ec796 100644
--- a/orchestra/contrib/lists/backends.py
+++ b/orchestra/contrib/lists/backends.py
@@ -130,7 +130,7 @@ class MailmanBackend(MailmanVirtualDomainBackend):
             self.append(textwrap.dedent("""\
                 # Create list alias for custom domain
                 aliases='%(aliases)s'
-                if ( ! grep '\s\s*%(name)s\s*$' %(virtual_alias)s ); then
+                if ! grep '\s\s*%(name)s\s*$' %(virtual_alias)s > /dev/null; then
                     echo "${aliases}" >> %(virtual_alias)s
                     UPDATED_VIRTUAL_ALIAS=1
                 else
@@ -150,7 +150,7 @@ class MailmanBackend(MailmanVirtualDomainBackend):
         else:
             self.append(textwrap.dedent("""\
                 # Cleanup possible ex-custom domain
-                if ( ! grep '\s\s*%(name)s\s*$' %(virtual_alias)s ); then
+                if ! grep '\s\s*%(name)s\s*$' %(virtual_alias)s > /dev/null; then
                     sed -i "/^.*\s%(name)s\s*$/d" %(virtual_alias)s
                 fi""") % context
             )
diff --git a/orchestra/contrib/mailboxes/backends.py b/orchestra/contrib/mailboxes/backends.py
index 7d6a93aa..232997bb 100644
--- a/orchestra/contrib/mailboxes/backends.py
+++ b/orchestra/contrib/mailboxes/backends.py
@@ -27,7 +27,7 @@ class SieveFilteringMixin(object):
                 su %(user)s --shell /bin/bash << 'EOF'
                     mkdir -p "%(maildir)s/.%(box)s"
                 EOF
-                if ( ! grep '%(box)s' %(maildir)s/subscriptions ); then
+                if ! grep '%(box)s' %(maildir)s/subscriptions > /dev/null; then
                     echo '%(box)s' >> %(maildir)s/subscriptions
                     chown %(user)s:%(user)s %(maildir)s/subscriptions
                 fi
@@ -68,7 +68,7 @@ class UNIXUserMaildirBackend(SieveFilteringMixin, ServiceController):
         context = self.get_context(mailbox)
         self.append(textwrap.dedent("""
             # Update/create %(user)s user state
-            if ( id %(user)s ); then
+            if id %(user)s ; then
                 old_password=$(getent shadow %(user)s | cut -d':' -f2)
                 usermod  %(user)s \\
                     --shell %(initial_shell)s \\
@@ -148,7 +148,7 @@ class DovecotPostfixPasswdVirtualUserBackend(SieveFilteringMixin, ServiceControl
     
     def set_user(self, context):
         self.append(textwrap.dedent("""
-            if ( grep '^%(user)s:' %(passwd_path)s ); then
+            if grep '^%(user)s:' %(passwd_path)s > /dev/null ; then
                sed -i 's#^%(user)s:.*#%(passwd)s#' %(passwd_path)s
             else
                echo '%(passwd)s' >> %(passwd_path)s
@@ -159,7 +159,7 @@ class DovecotPostfixPasswdVirtualUserBackend(SieveFilteringMixin, ServiceControl
     
     def set_mailbox(self, context):
         self.append(textwrap.dedent("""
-            if ( ! grep '^%(user)s@%(mailbox_domain)s\s' %(virtual_mailbox_maps)s ); then
+            if ! grep '^%(user)s@%(mailbox_domain)s\s' %(virtual_mailbox_maps)s > /dev/null; then
                 echo "%(user)s@%(mailbox_domain)s\tOK" >> %(virtual_mailbox_maps)s
                 UPDATED_VIRTUAL_MAILBOX_MAPS=1
             fi""") % context
@@ -252,7 +252,7 @@ class PostfixAddressVirtualDomainBackend(ServiceController):
         if domain.name != context['local_domain'] and self.is_hosted_domain(domain):
             self.append(textwrap.dedent("""
                 # %(domain)s is a virtual domain belonging to this server
-                if ( ! grep '^\s*%(domain)s\s*$' %(virtual_alias_domains)s) ); then
+                if ! grep '^\s*%(domain)s\s*$' %(virtual_alias_domains)s > /dev/null; then
                     echo '%(domain)s' >> %(virtual_alias_domains)s
                     UPDATED_VIRTUAL_ALIAS_DOMAINS=1
                 fi""") % context
@@ -266,7 +266,7 @@ class PostfixAddressVirtualDomainBackend(ServiceController):
         if self.is_last_domain(domain):
             self.append(textwrap.dedent("""
                 # Delete %(domain)s virtual domain
-                if ( grep '^%(domain)s\s*$' %(virtual_alias_domains)s ); then
+                if grep '^%(domain)s\s*$' %(virtual_alias_domains)s > /dev/null; then
                     sed -i '/^%(domain)s\s*/d' %(virtual_alias_domains)s
                     UPDATED_VIRTUAL_ALIAS_DOMAINS=1
                 fi""") % context
@@ -326,13 +326,13 @@ class PostfixAddressBackend(PostfixAddressVirtualDomainBackend):
             self.append(textwrap.dedent("""
                 # Set virtual alias entry for %(email)s
                 LINE='%(email)s\t%(destination)s'
-                if ( ! grep '^%(email)s\s' %(virtual_alias_maps)s ); then
+                if ! grep '^%(email)s\s' %(virtual_alias_maps)s > /dev/null; then
                     # Add new line
                     echo "${LINE}" >> %(virtual_alias_maps)s
                     UPDATED_VIRTUAL_ALIAS_MAPS=1
                 else
                     # Update existing line, if needed
-                    if ( ! grep "^${LINE}$" %(virtual_alias_maps)s ); then
+                    if ! grep "^${LINE}$" %(virtual_alias_maps)s > /dev/null; then
                         sed -i "s/^%(email)s\s.*$/${LINE}/" %(virtual_alias_maps)s
                         UPDATED_VIRTUAL_ALIAS_MAPS=1
                     fi
@@ -352,7 +352,7 @@ class PostfixAddressBackend(PostfixAddressVirtualDomainBackend):
     def exclude_virtual_alias_maps(self, context):
         self.append(textwrap.dedent("""
             # Remove %(email)s virtual alias entry
-            if ( grep '^%(email)s\s' %(virtual_alias_maps)s ); then
+            if grep '^%(email)s\s' %(virtual_alias_maps)s > /dev/null; then
                 sed -i '/^%(email)s\s/d' %(virtual_alias_maps)s
                 UPDATED_VIRTUAL_ALIAS_MAPS=1
             fi""") % context
diff --git a/orchestra/contrib/saas/backends/bscw.py b/orchestra/contrib/saas/backends/bscw.py
index 4a67c914..351f5276 100644
--- a/orchestra/contrib/saas/backends/bscw.py
+++ b/orchestra/contrib/saas/backends/bscw.py
@@ -19,10 +19,10 @@ class BSCWBackend(ServiceController):
     def validate_creation(self, saas):
         context = self.get_context(saas)
         self.append(textwrap.dedent("""\
-            if ( %(bsadmin)s register %(email)s ); then
+            if %(bsadmin)s register %(email)s > /dev/null; then
                 echo 'ValidationError: email-exists'
             fi
-            if ( %(bsadmin)s users -n %(username)s ); then
+            if %(bsadmin)s users -n %(username)s > /dev/null; then
                 echo 'ValidationError: user-exists'
             fi""") % context
         )
@@ -31,7 +31,7 @@ class BSCWBackend(ServiceController):
         context = self.get_context(saas)
         if hasattr(saas, 'password'):
             self.append(textwrap.dedent("""\
-                if ( ! %(bsadmin)s register %(email)s && ! %(bsadmin)s users -n %(username)s ); then
+                if [[ ! $(%(bsadmin)s register %(email)s) && ! $(%(bsadmin)s users -n %(username)s) ]]; then
                     # Create new user
                     %(bsadmin)s register -r %(email)s %(username)s '%(password)s'
                 else
diff --git a/orchestra/contrib/saas/backends/dokuwikimu.py b/orchestra/contrib/saas/backends/dokuwikimu.py
index c172cd73..aa81c855 100644
--- a/orchestra/contrib/saas/backends/dokuwikimu.py
+++ b/orchestra/contrib/saas/backends/dokuwikimu.py
@@ -37,7 +37,7 @@ class DokuWikiMuBackend(ServiceController):
         )
         if context['password']:
             self.append(textwrap.dedent("""\
-                if ( grep '^admin:' %(users_path)s ); then
+                if grep '^admin:' %(users_path)s > /dev/null; then
                     sed -i 's#^admin:.*$#admin:%(password)s:admin:%(email)s:admin,user#' %(users_path)s
                 else
                     echo 'admin:%(password)s:admin:%(email)s:admin,user' >> %(users_path)s
diff --git a/orchestra/contrib/saas/backends/drupalmu.py b/orchestra/contrib/saas/backends/drupalmu.py
index 9d51aac9..d97132e4 100644
--- a/orchestra/contrib/saas/backends/drupalmu.py
+++ b/orchestra/contrib/saas/backends/drupalmu.py
@@ -28,7 +28,7 @@ class DrupalMuBackend(ServiceController):
             # the following assumes settings.php to be previously configured
             REGEX='^\s*$databases\[.default.\]\[.default.\]\[.prefix.\]'
             CONFIG='$databases[\'default\'][\'default\'][\'prefix\'] = \'%(app_name)s_\';'
-            if ( ! grep $REGEX %(drupal_settings)s ); then
+            if ! grep $REGEX %(drupal_settings)s > /dev/null; then
                echo $CONFIG >> %(drupal_settings)s
             fi""") % context
         )
diff --git a/orchestra/contrib/saas/backends/phplist.py b/orchestra/contrib/saas/backends/phplist.py
index e8281556..d35cc2b0 100644
--- a/orchestra/contrib/saas/backends/phplist.py
+++ b/orchestra/contrib/saas/backends/phplist.py
@@ -83,7 +83,7 @@ class PhpListSaaSBackend(ServiceController):
             context['escaped_crontab'] = context['crontab'].replace('$', '\\$')
             self.append(textwrap.dedent("""\
                 # Configuring phpList crontabs
-                if ( ! crontab -u %(user)s -l | grep 'phpList:"%(site_name)s"' ); then
+                if ! crontab -u %(user)s -l | grep 'phpList:"%(site_name)s"' > /dev/null; then
                 cat << EOF | su %(user)s --shell /bin/bash -c 'crontab'
                 $(crontab -u %(user)s -l)
                 
diff --git a/orchestra/contrib/systemusers/backends.py b/orchestra/contrib/systemusers/backends.py
index 0d109d23..7e11897a 100644
--- a/orchestra/contrib/systemusers/backends.py
+++ b/orchestra/contrib/systemusers/backends.py
@@ -33,7 +33,7 @@ class UNIXUserBackend(ServiceController):
         # TODO userd add will fail if %(user)s group already exists
         self.append(textwrap.dedent("""
             # Update/create user state for %(user)s
-            if ( id %(user)s ); then
+            if id %(user)s ; then
                 usermod %(user)s --home %(home)s \\
                     --password '%(password)s' \\
                     --shell %(shell)s %(groups_arg)s
@@ -60,7 +60,7 @@ class UNIXUserBackend(ServiceController):
         if context['home'] != context['base_home']:
             self.append(textwrap.dedent("""
                 # Set extra permissions: %(user)s home is inside %(mainuser)s home
-                if ( mount | grep "^$(df %(home)s|grep '^/')\s" | grep acl ); then
+                if mount | grep "^$(df %(home)s|grep '^/')\s" | grep acl > /dev/null; then
                     # Accountn group as the owner
                     chown %(mainuser)s:%(mainuser)s %(home)s
                     chmod g+s %(home)s
diff --git a/orchestra/contrib/webapps/backends/__init__.py b/orchestra/contrib/webapps/backends/__init__.py
index 4bdfba61..dfd60f34 100644
--- a/orchestra/contrib/webapps/backends/__init__.py
+++ b/orchestra/contrib/webapps/backends/__init__.py
@@ -28,11 +28,11 @@ class WebAppServiceMixin(object):
         if context['under_construction_path']:
             self.append(textwrap.dedent("""
                 # Set under construction if needed
-                if [[ $CREATED == 1 && ! $(ls -A %(app_path)s) ]]; then
+                if [[ $CREATED == 1 ]] && ! ls -A %(app_path)s > /dev/null; then
                     # Async wait 2 more seconds for other backends to lock app_path or cp under construction
                     nohup bash -c '
                         sleep 2
-                        if ( ! ls -A %(app_path)s ); then
+                        if ! ls -A %(app_path)s > /dev/null; then
                             cp -r %(under_construction_path)s %(app_path)s
                             chown -R %(user)s:%(group)s %(app_path)s
                         fi' &> /dev/null &
diff --git a/orchestra/contrib/webapps/backends/php.py b/orchestra/contrib/webapps/backends/php.py
index 65b18454..849b7c8c 100644
--- a/orchestra/contrib/webapps/backends/php.py
+++ b/orchestra/contrib/webapps/backends/php.py
@@ -168,7 +168,7 @@ class PHPBackend(WebAppServiceMixin, ServiceController):
             }
             if [[ $is_last -eq 1 ]]; then
                 if [[ $UPDATED_APACHE -eq 1 || "$state" =~ .*RESTART$ ]]; then
-                    if ( service apache2 status ); then
+                    if service apache2 status > /dev/null; then
                         service apache2 reload
                     else
                         service apache2 start
diff --git a/orchestra/contrib/websites/backends/apache.py b/orchestra/contrib/websites/backends/apache.py
index 0e033535..e019a203 100644
--- a/orchestra/contrib/websites/backends/apache.py
+++ b/orchestra/contrib/websites/backends/apache.py
@@ -158,7 +158,7 @@ class Apache2Backend(ServiceController):
             }
             if [[ $is_last -eq 1 ]]; then
                 if [[ $UPDATED_APACHE -eq 1 || "$state" =~ .*RESTART$ ]]; then
-                    if ( service apache2 status ); then
+                    if service apache2 status > /dev/null; then
                         service apache2 reload
                     else
                         service apache2 start